I'm confused. The gang box sticks out a half inch from the studs. How do you install the drywall without first cutting the hole?

the box is only 1/4inch past studs. not 1/2. the drywall will just float over the box. so when you hang the drywall, only use 3 or 4 screws- just enough to hold it in place. then use the magnet to find your box, and cut it out. then finish screwing in the drywall. This tool works great. i just did an entire house with absolutly zero problems

Will it work through osb

On the back of the box it says the following:"Works on drywall, plywood, particle board, laminated flooring, Masonite, exterior siding, cement board, tile, and slate."Thanks,General Tool

What tool are you using to cut the sheet rock i feel like a dremel would cut right through the metal wire being used to hold the magnet to the box

Commercial drywallers use drywall routers/Rotozips(large Dremels spinning at 9000rpm). But you can use anything. You will not come in contact with the inside of the box, maybe the tabs of the outside of box. The outside marker magnet is larger than the inside box magnet and spring tabs. If you are worried about even touching the outside tabs of an electrical box, set your depth on the bit to that of the drywall.

Does the electrical box have to be empty

With this kit, yes the box would need to be empty, but they also make something called a plug mark that plugs into an existing wall outlet. Of course that doesn't work for light switches. But there is always lipstick for those.http://www.amazon.com/gp/product/B00XUY9FB8?psc=1&redirect=true&ref_=od_aui_detailpages02

Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool

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Description

🧰 Nail every cutout like a pro—no measuring, no mistakes, just flawless drywall every time!

ALL IN ONE PRO KIT - Includes 3 target magnets, locator, and rugged case for organized, on-the-go use.
DOUBLE YOUR EFFICIENCY - Complete drywall cutouts twice as fast with zero measuring or rework.
LIFT LESS WORK SMARTER - Install drywall once, mark, and cut—cutting fatigue and injury risk in half.
PRECISION MAGNET ALIGNMENT - Rare-earth magnets snap perfectly to locate boxes behind drywall—no guesswork.
VERSATILE MATERIAL COMPATIBILITY - Works flawlessly on drywall, plywood, paneling, cement board, and more.

The Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool uses powerful rare-earth magnets to locate electrical boxes behind drywall and other materials, enabling perfect cutouts twice as fast without measuring. Designed to reduce lifting and eliminate errors, this professional-grade kit includes three target magnets, a locator, and a durable carrying case, making drywall installation faster, easier, and more precise.

Specifications

ASIN	B00YX8KZGO
Best Sellers Rank	#50,747 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #160 in Tool Boxes
Brand	Calculated Industries
Brand Name	Calculated Industries
Color	Multi
Colour	Multi
Customer Reviews	4.6 out of 5 stars 3,236 Reviews
Included Components	Includes 3 target magnets, 1 target locator magnet, and a rugged carrying case
Is Electric	Yes
Item Type Name	Calculated Industries 8105 Blind Mark Drywall Electrical Box Cutout Tool – Powerful Rare-Earth Magnetic Targets (3) and Locator Kit
Item Weight	1 Pounds
Item weight	1 Pounds
Manufacturer	Calculated Industries
Manufacturer Part Number	8105
Material	Hard Plastic, Metal
Material Type	Hard Plastic, Metal
Model Number	8105
Number of Pieces	1
Number of pieces	1
Power Source	Hand Powered
Style	Modern
Style Name	Modern
UPC	854979001007 785577173264 723434515680 785533856187 796084335670 733353688501 787721523956 098584001735
Unit Count	1 Count

Reviews

M**T

Not for Australia / New Zealand

22.08.2020

M**N

Très bon produit.

J'ai pas le compas dans l'oeuil et mes ouvertures dans la plaque au plâtre était plus souvent qu'autrement aproximatives. On rénove notre sous sol et on gagne énormément de temp avec cet outil. c'est incroyablement simple et efficace. Je recommande a tous castor bricolleur. Ceci dit, même si c'est conçu pour des boitier en plastique ça fonctionne aussi avec les boitier en metal.

21.06.2025

T**Z

Great tool for easy cutouts

4.11.2025

A**R

Great tool, big efficiency gains

27.12.2024

J**H

Great product

4.01.2026

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