One inch base fits wrench or bench vise;Thin wall construction allows use without removal of cones and locknuts;FR-1.3 has 12 splines, 22.6mm diameter fits Shimano, Sachs Aris, Sun Race, DNP Epoch and other 5ﾃ｢ﾂﾂ10 speed freewheels;FR-1.3 works the same as FR-1.2 but now features an enlarged thru-hole to accommodate 14mm axles;Use with Park FRW-1 Freewheel Remover Wrench, SR-11 Sprocket Remover, PAW-12 Adjusting 12ﾃ｢ﾂﾂ Wrench or any heavy duty bench type vise