Laiwei Bi-Metal Hole Saw Kit, 7 Pcs 7/8" to 2-1/2" General Purpose Hole Saw Drill Bits, HSS Hole Cutter with Arbor for Wood, Plastic, Drywall, Size(22,25,28,35,44,51,64)

The media could not be loaded. My Desktop PC case didn't have enough ventilation. Front side of it was basically a metal sheet with no holes at all. I got this fancy drill bit and used it with a CORDLESS drill.. Now that I think if it, it would've worked slightly better with more powerful 750W corded drill. Main issue is that when I got to about 75% of the metal sheet cut - the drillbit was getting stuck in it and the metallic case was vibrating violently. So I had to really keep it held tight. It would've not been an issue with a more powerful tool, or if I had a workbench to secure the PC case.Ultimately the hole is there, not 100% perfect, but looks good in the final product.Considerations:- it works even with a cordless drill- the hole for PC case fan looks OKAY- it would've worked better (less vibrations, more precise cut) with more powerful corded drill

Worked great in fiberglass

I needed 3 holes in 3/4" double-sided oak veneered plywood. I wanted to use my Dewalt quick-change mandrel.I drilled 1 test hole then the 3 finish holes. The saw did an excellent job for me. There was no chipping or tear-out on the finished side; however, on the back side there was significant tear out. I didn't notice any difference in speed on the 4th hole. It cuts pretty quick for a hole saw in 3/4" plywood. The paint started pealing off on the 3rd hole but that's no big deal for me. I highly recommend using a small pilot hole before using the larger bit that comes with it. I didn't drill a small pilot hole and the larger bit skated a little off of where I wanted it to be.The mandrel threads are not perfectly square with the surface of the saw. This isn't a big deal if you're using the included mandrel. For me the Dewalt mandrel threaded fine until the last 1/8" or so. I used channel locks to finish threading the saw. This is when I found the out-of-square mandrel threads as the saw doesn't sit flush on the back side of the saw. It's also when I discovered the holes for a quick-change mandrel are not spaced properly for my Dewalt mandrel. The 4 holes should be standard for quick-change mandrels. I had to use a hammer to get the mandrel pins into the saw holes. The pic shows the holes are just a little off from where they should be causing a tight fit of the pins.I've never used a spring on a hole saw but it works great. All 4 remnants popped out as soon as I was through the plywood.All in all the hole saw worked great for me. It just took a little effort to use my quick-change mandrel.

Goal:Install USB, audio and HDMI ports into the front of my arcade machineHoles required:30mm38mmWood thickness:Close to half an inchType of wood:Laminated thick particle board (it's VERY sturdy)My experience with drilling:I'm a noobie. Also my first time using a hole saw drill bit.Drill i used:Some old school corded drill that i borrowed.__________Product Pros & Cons....Pros:- Drill bit works on a hand held drill- It works (my photos show the result)- It's pretty sharp. Not exacto knife razor sharp but obviously sharp to cut all my holes.- I guess this is what they mean by "self-feeding" the drill bit drilled into the wood first, then the hole saw grabs onto the wood and then it begins cutting the hole. This made it VERY easy to cut a perfect circle.- It has slots on the sides of the drill bit. Makes it easy to stick a flat head screwdriver into the slots to eject the wood that gets stuck in the drill bit (My photo shows the wood caught in the drill bit)TIP:Stick the flat head screwdriver into one of the slots. Push the wood out a bit. Then take the screwdriver out, and place it into the other slot. And push the wood out. And keep going back and forth slowly pushing in each hole until the wood pops out or enough to where you can grab the wood by hand and pull it out.BUT BE CAREFUL:The metal drill bit will be VERY HOT after you drill with it. Don't touch it with your bare hands. Give it a few minutes to cool down. Unless you have protective gloves or something like that.- The drill bit is red. I do like the color Red. So that's neat. But just know. After i drilled a few holes. The red paint job starts to get worn down. It looks like a beaten down iron man suit after 1 or 2 holes. But that's fine. The color doesn't matter.- Packaging. Comes exactly like it's shown. They come in small light weight individual plastic cases. So when you're done, you can store the drill bit into the case. The case has a label with the drill bit size.- Spring. This drill bit has a spring. I honestly have no idea how useful that is or how that works. I just know the product works.- My holes were cut very straight. Took a small amount of effort. Took me 1 minute or less to cut through. I was going around a medium speed. I was trying to be very careful not to bang my hand into the wood once i broke through and was also being careful not to have the drill twist my wrist. Toward the end of the hole the drill slightly wanted to twist but i held on with 2 hands to prevent it._____________CONS:- The holes i made were not 100% perfect (some VERY TINY wood chipped around the edges of the hole) but this is probably my rookie mistake. I used a black sharpie to clean up small little chips. The adapters i installed cover some of the imperfections.TIP:When you drill into wood, the side that is visible is the side you want to drill into. Because the other side of the wood will be pretty damaged. Basically. The wood on the inside of the arcade wood cabinet, it's badly damaged once i made the holes. Wood is very badly chipped. But that's fine. No one will see that side.MAKE SURE YOUR DRILL IS SPINNING IN THE CORRECT DIRECTION OR YOU WILL BREAK THE DRILL BIT- My 38mm drill bit broke (BUT IT WAS MY FAULT)Lack of instructions. They expect you to know what you're doing. I borrowed the drill i used. It was given to me and it was set in the wrong direction. I didn't notice. I didn't think it even mattered. Until the 38mm drill bit broke. I had no problems with the 30mm drill bit. But the 38mm bit has threads to allow the hole saw to be removed. You can spin the hole saw on and off with your bare hands. So when i cut with the 38mm in the wrong direction. The wood saw caught into the wood and it couldn't spin in that direction. So I accidentally stripped the threads that hold the 38mm hole saw in place.Rookie mistake.TEST HOLES:As you can see from my photos. I did test holes. I cut holes into foam core, then stuck the adapters in. Just to test it. I imagine you can do the same with cardboard boxes. Good way to test to see if it's the correct size you need.OTHER INFO:For anyone buying those USB 3.0, etc adapters, if you're wondering what size they use here's the info:dual usb 3.0 = 30mm holeusb 3.0 + audio = 30mm holedual HDMI = 38mm hole

good quality for the price. Cut a nice clean hole through my siding, sheathing and footer for a 6" oven vent hood.

I needed to upgrade the sewer drain door on my motorhome which required a larger hole. This 5 1/2" hole saw worked very well for the task I had. It cut right through the compartment floor with no problem.

It gets the job done, was able to install puck lights in my basement ceiling. DO believe the warnings about the saw spinning off the arbor. I assumed folks were using it wrong, giving it too much opportunity to spin. No, the saw is heavy and will keep spinning even if the drill is only used at very low speed. Combine that with no stops and short threads on the arbor, and the saw comes right off. Fortunately I had a decent arbor with pins to engage the holes in the saw. With the good arbor the saw works fine. Even with throwing out the included arbor, this saw is a reasonable value if you just need to cut a few holes.

super cheap product. teeth were all different sizes and dull. there is no material to have these professionally sharpened either. garbage out the box. returning asap. do not purchase.