THE RUKO COBALT DRILL BIT IS MADE FROM HEAVY DUTY HIGH SPEED STEEL WITH 5% COBALT ADDED TO THE STEEL.

This set contain 25 bits from 1mm to 13mm with 0.5 increments. The cobalt gives the bits a higher heat resistance and hardness for longer tool life. These drill bits are used for drilling unalloyed and alloyed steel, hot and cold working steel, reinforced and case hardened steel and steel resistant to rust or acid.

• Cobalt added for strength
• Heat resistance
• Excellent quality
• For steel & metal
• Very good on stainless steel & cast iron

ProWeld Tip

Cobalt bits are excellent but when using in a pistol drill they can snap easy because they are more brittle than usual HSS drill bits.