- made by HSS with heat treatment and titanium nitride coating
- engraved sizes to easily identify which size you need with the conrtasted, laser engraved size inside the step drill bit flute
- drill round holes in most metals, plastic, wood, etc.
- self-starting tips will not skid
- designed to auto debur the hole
- used on electric drill and drill presses
- triangular shank will not spin inside chuck