HSS-Co Heavy Duty Straight Shank Jobber Drills (Inch) heavy duty drill made of 5% cobalt material with excellent heat resistance. To drill steels with tensile strength up to 1,400 N/mm², very hard bronze, stainless steels as well as heat and acid resistant steels. Features and Benefits • 5% cobalt material with excellent heat resistance • Can be used to drill steels with tensile strength up to 1,400 N/mm² Specifications • Cobalt construction (5%) • Point angle: 135° • Helix angle: Normal • Web thickness: Strengthened • Relief angle: Normal • Tolerance of diameter: H8 • Tolerance of shank: F11 • Manufacturing Standard: BS 328, DIN 338B Typical Applications • Very hard bronze • Stainless steels • Acid resistant steels • Heat resistant steels