Herm Sprenger - Chrome Plated Steel Additional Prong Links for Herm Sprenger Ultra-Plus Dog Training Collar - for Small Medium Large Dogs - Made in Germany (2.25 mm)

I needed an extension for my puppy’s first training collar but didn’t want to buy an entirely new collar. I actually prefer the smaller collar which has smaller links and more prongs. These prongs fit right into her existing collar and made it so it fits properly since she has grown. The quality of metal seems to be the same as the original, the strength it takes to pinch to remove the links is about the same as well. They are not more flimsy. It is easy to put on and take off. These collars are VERY effective in teaching my strong and growing Lab pups how to properly be sensitive and not just muscle through their leash time. 10/10 would recommend these collars and the Herm Sprenger brand.

They fit great on the collar. Not like some of the knockoffs available here on Amazon. highly recommend

I purchased the original collar from a trainer and my dog filled out so I needed extenders. These worked perfectly. Easy to put on with pliers. Do not fall off and fit him perfectly now. Great value and I didn't have to buy a new expensive collar.

These fit perfectly with my dog's collar and provide the extra space he needs. He gained weight due to thyroid issues. Much cheaper than buying a whole new collar.

Worked perfect to make a my German Shepherd’s collar larger. Easy to install.