... 13pc HSS Twist drill set , material : COBALT,HSS 9341,HSS4341,HSS4241,high carbon steel Product DescriptionPower tool accessories, drill bits series, We ... are producer of drill bit series as electrical ... material : COBALT,HSS 9341,HSS4341,HSS4241,high carbon steel 13-pc HSS drill bit,white color,metal box