This is designed for installation or removal of 16 notch external bearings and is an excellent tool that is made to last. I used this to get a BB out of a friends frame that had seized in, no grease on the thread???, with the aid of a club hammer as a smaller one would not budge it; this left no real signs of damage to the tool which surprised me as I was welting it. The little plastic tool for the crank arm compression cap is removable but does spin freely on the arm so you can use it in its place, as it only needs between 4-6 in-lb of pressure to tighten it you don’t need to rip it up. The lever arm is 8½” (215mm) long so there is enough length to tighten things up, depending on rider weight or power production you may need to tighten it a bit more. The overall tool length is 11” (280mm) with the head width being 3” (77mm).