It's easy to eliminate excess cylinder and yoke endplay with these stainless steel bearings. Made by pistolsmith Ron Power as an alternative to stretching the yoke. Whether rebuilding worn guns or building custom ones, these will help turn out a 1st-class job. Each pak contains 10 bearings of 1 thickness. Mfg: Power Custom SPECS: Hardened 302 stainless steel. Cylinder Bearings - see chart. Yoke Bearings - .002" (.051mm) thick for S&W K,L,N.