DS-plus Shank Electric Hammer-Drill: It can be used with Electric Hammer of BOSCH Co., of AEG Co., of HILTI Co., of BLACK& DECKER Co., of MAKITA Co., of SKIL Co., of HITACHI Co., of TOSHIBA Co., The shank is round with dual-arc and dual-keyway Spesification; O.D = 5 - 22 Length = 110 - 440