29-pc HSS Twist drill set , material : COBALT,HSS 9341,HSS4341, ... drill bits, HSS twist drillbits, and combined dirll bit sets. 29-pc H. S. S. TITANIUM TWIST DRILL SET: Point Angle ... /135 material : COBALT,HSS 9341,HSS4341,HSS4241,high carbon steel 29-pc HSS drill bit,white color