... drilling tools (Tapered Drill Steel)Including:Shank H22x 108mm, (6, 7, 11, 12 degree taper) taper rods in most lengths.A comprehensive range ... bits and chisel bits with (6, 7, 11, 12 degree taper).Bit diameter: 28mm-57mm.3. Extension drilling toolsButton bit, face ... construction tools.7. Round road planning bit for road milling machine and machine.Shank diameter=19.4mm, 25mm, 30mm, 33mm, 38mm, etc.8 ...