RUKO HSS Spiral Fluted Step Drill Bit Set in Plastic Case, Bright Finish, 3 Pieces, 101026RO

ManoMano

The spiral-shaped flute ensures absolutely silent operation and high cutting efficiency. Non-breakable chips are removed cleanly, just like with a spiral drill. This reduces the formation of burrs and cold welds on the cutting edges. The cone facilitates removal from the punched sheets.

Amazon

Shank: 3-way clamping surface Cutting direction: Right hand cut Point angle: 118 degree Cone angle: 20-30 degree Point cut: Shape C Split point