2 spiral flutes on each step drill bit remove chips and help pull the bit through material for faster cutting
Titanium nitride coating dissipates heat for longer bit life
1/4-Inch hex shank for firm, positive grip in impact driver and standard drill
Split point tip quickly starts hole cuts and prevents drifting when pressure is added
Kit comes with a convenient 1-Ounce oil bottle for lubrication between cuts to prolong step bit life
Rugged case snaps shut with custom inserts for each bit and oil bottle
Total of 37 hole sizes