High-quality HSS, with 5% cobalt alloy, providing durability and high performance. Suitable for cutting hard metal such as stainless steel, steel and cast iron as well as wood and aluminium alloy. Fully ground spiral groove design clears particles quickly and decreases friction and heat for fast and cool drilling. 135° split-point with straight shank prevents 'walking' and makes drilling precise and faster. No centre punch required. Straight, round shank; accruate centring, minimum of turning or grinding needed. Bronze oxide finish. Supplied in a sturdy case. High-Speed Steel Straight Shank 1mm-13mm Dia. Drill Bits Suitable for Metal High-Speed Steel Tip For Use with 3-Jaw Chuck Machines on Rotary Action Connecx Compatible with Most Power Tool Brands High-Speed Steel Straight Shank 1mm-13mm Dia. Drill Bits Suitable for Metal High-Speed Steel Tip For Use with 3-Jaw Chuck Machines on Rotary Action Connecx Compatible with Most Power Tool Brands