BLUE RING TwinBox Machine Tap + Twist Drill, DIN 371, HSS-E, M 3 x 0.5 

for wear restistant steel up to 1.200 N/mm² - high alloy steel - short chipping material - short-chipping stainless steel - alloy tool steel - for through holes HSS-CO Twist Drill DIN 338 Form C right, 130° - Spiral: 25-30° with Split Point Thread type: metric ISO-thread DIN 13 Norm: DIN 371 Material: HSS-E