QUICK CHANGE DISC HOLDER 1-7/8" diameter head , 1-1/2" long shank , 2-3/8" overall length.  Rated 30,000 RPM, rubber pad, steel mandrel, aluminum and brass core. 1/4" shank makes this unit compatible with power drills, grinders, and many other power tools. SIZE DIA(MM) TYPE 1″ 24 R/S/P 1-1/2″ 32 R/S/P 2″ 45 R/S/P 3″ 68 R/S/P