When I got these grips I was extremely impressed by the build quality. They were solid and robust.

Too robust in fact that it is almost impossible to pry them open and put on the bar. I had to stick a small screwdriver handle in between the opening to loosen the grips. Once they widened, I set them on the ez curl bar I was using. After a total of 3 days of loosening the opening, I finally managed to brute force the grip onto the bar by jamming it in. It fits in well and the grip is not coming loose anytime soon.

I would caution anyone buying this if they plan to use the grip interchangeably with different bars/equipment. It is almost impossible to put on and take off. As a positive I know that the grip will last and not shift and move on my bar. The grip feels really solid and good in the hands when curling.

If you have never used these I woud start with the smaller ones first so your hand and fingers get use to it. Cause they do tend to get soar. If you start with the thicker ones you may not be able to complete the exercise. I got the 2.5 and 3 to start me off. 2.5 has really created more finger muscle fibers cause I feel my grip strength much more stronger. I can hold on to barbels and any rods much more longer when not using these grips strength enhancers. I feel like my hand shake is much more solid. Handshake, because I do a few business meetings and I shake hands a lot.

I can deadlift 400lbs without straps, and I lift with a 2.25" axle all the time, but the real test of finger strength is just opening these darn things up to put onto a bar or dumbbells. I like these grips, I just wish the rubber was a little less firm so I didn't have to kill myself putting them on/taking them off every time I want to use them.