HOLZPROFI HS wood twist drill bit refill set 5 and 6 mm with two pre-cutters and two main cutting edges. 2000-5000 rpm speed. Particularly smooth-running for ALL wood materials. Tear-free and position-neutral in end grain, particularly smooth-running for hand drills, end grain, laminated boards, and MDF with a clean entry and exit. The universal drill bit for ALL wood materials.