"4 cutter type comes with SDS Plus shank,its 4 cutting edges design will make the drilled hole smoother and rounder.Its smooth and wide grooves will leave concrete dust easily and rapidly.Impact power will transmit softly to the head pit and it will reduce stress to the user.the high volume double fluteâ Shortened spiral windings and conical shaped dust tracks for extra fast material removal intoâ Improved soldering process of Carbide chip with fluteâ Secondary cutters protect drill bit in the event of reinforcement collisionâ Reduced friction and centralized alignment in drilled holeâ Centering point for exact spot drillingâ Special primary cutting geometry For more specifications we not display in the list below due to the layout, Diameter:4---40mm availableOverall length:110--1000mm available, Welcome you specific inquiry."