ULTRA-PLUS Easy On Training Collar with Center-Plate & Assembly Chain - Stainless Steel

I have used Sprenger training collars with success for large breed dogs on multiple occasions. However, now that I'm older, I have Arthritis, Carpal Tunnel Syndrome and Dupuytren's Contracture in my hands, so pinching the links to put a training collar on our dog is very difficult without assistance. Using the Easy On training collar is so much easier! Once you have it properly fitted for your dog, you never have to pinch the links again. The unique design of the assembly chain makes it easy to put the training collar on over your dog's head. If needed, for added safety, you can flip the prongs outward, so they face away from your dog's head while putting it on. Once it's in place, just roll the links to flip them back into place, and you're good to go.

I purchased it because my fingers are so weak.
It is not safe pulled it over dog head. I tried but I almost scratched my Australian Shepherd eye. Even he has small head.
But it is longer then other caller because those rings are not connected before you attach leash, so it makes easier open and close.
I got 2.25 mm for 44lb Australian shepherd.
Great quality so far