HSS-R roll forged 4341 high speed steel. Manufactured to DIN338 with 118° point. General purpose ‘jobber’ drill bits for drilling steel, aluminium, non-ferrous metals, plastics and wood. Use cooling agent and drill at slow speeds for best results in metals. HSS-R roll forged 4341 high speed steel. Manufactured to DIN338 with 118° point. General purpose ‘jobber’ drill bits for drilling steel, aluminium, non-ferrous metals, plastics and wood. Use cooling agent and drill at slow speeds for best results in metals.