Enhanced part excluding the head and the body are improved for reduced breakage rate and increased torque transmission capacity.The bit is not easy to be pulled out and the head of the screw does not collapse easily.Dimension (mm)d x Total Length:4.2 x 45Thread Length (mm):39Type:Full ThreadQ'ty Per Bag (piece):Approx. 120Bugle headSteelSurface Treatment: Unichrome platedA square No. 2 bit is included