RUKO RUKO 101026TRO Step drill bit set 3-piece 4 - 12 mm, 4 - 20 mm, 4 - 30 mm HSS Triangular shank 1 Set

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 when the metal sheet is drilled through. This text is machine translated.