RUKO Step drill bit 4 - 20 mm HSS Total length 75 mm 1 pc(s)

Size No. 1. Drilling range 4.0 - 20.0 mm.NEXT GENERATION - With this robust tool, sheets can be centered, drilled, drilled and deburred in one operation.The deep-ground and spiral-shaped clamping groove offers absolute smoothness and high cutting performance. In particular, chips that do not break are cleanly transported away as with a twist drill. This reduces the formation of surface-mounted cutting edges and cold welding on the cutting edges. The cone makes it easier to pull back on pierced sheets. HSS Co 5: High-performance high-speed working steel with 5% cobalt content. High toughness and heat resistance, for drilling in hard-to-work materials with a strength of up to 1100 N/mm². This text is machine translated.