WHITE RING TwinBox Machine Tap + Twist Drill, DIN 371, HSS-E, M 4 x 0.7 

for stainless steele, long-chipping up to 1.000 N/mm² - long-chipping, heat resistant steel - abrasive material - for blind holes Surface treatment: steatempered: - improved adhesion of the coolant and Lubricant - reduces tearing of the lubricating filand the formation of cold welding 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