Made from heat treated 4130 steel and houses 3 heat treated S7 tool steel pawls. Features 36 points/ 10 degrees of engagement. Fully rebuildable and uses ABEC 5 bearings (ABEC 3 on 16t) . Freewheels are 18.4mm wide and fit 1.375 x 24 TPI hub threaded hubs . Fits 1/8″ or 3/32″ chain (16t version only fits 3/32″ chain) .