Ruko Step drill bit HSS, spiral fluted with cross grinding

Drilling range 4.0 - 20.0 mm. Next generation - With this robust tool, sheets can be centered, pre-drilled, reamed, and deburred in a single operation. The deep-ground, spiral flute provides absolute smoothness and high cutting performance. In particular, non-breaking chips are cleanly removed like with a spiral drill. This reduces the formation of built-up edges and cold welds on the cutting edges. The cone shape facilitates retraction when drilling through sheets. HSS: High-performance high-speed steel for drilling in easily machinable materials with a strength of up to 900 N/mm².