... bits, cross type bits and chisel bits with(6,7,11,12 degree taper).Bit diameter:28mm-57mm.3.Extension drilling toolsButton bit ... ,R25,R28,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with tight tolerances and controlled straightness.4.Down the hole hammers ... .7.Round road planing bit for road milling machine and trenching machine. Shank dia:19.4mm,25mm,30mm,33mm,38mm,etc.8 ...