Step drill bit size 1, 4-20mm HSS bright+spiral flute+hex shank, 9 steps+cross ground

The deep-ground and spiral flute ensures absolutely smooth running and high cutting performance. In particular, non-breaking chips are cleanly removed, as with a twist drill. This reduces the formation of built-up edges and cold welding on the cutting edges. The taper facilitates retraction when drilling through sheet metal. 4.0 - 12.0 mm / 4.0 - 20.0 mm / 4.0 - 30.0 mm Further technical properties: · Point angle: 118° · Step angle: 90° · Ø: 4.0 - 20.0mm · Cutting material: HSS · Size No.: 1 · Shank: Bit shank · Point grind: Form C: Split point · Cutting direction: right-hand cutting · Tolerance: Factory standard · Main applications: Steel (N/mm2) · Secondary application: Bronze, cast iron