Irwin Tools IRWIN Step Drill Bit, 3/16" to 7/8", Titanium Nitride Coated Nitrate, 3/8" Shank (15104)

Titanium Nitride finish causes less friction which increases speed and increases product life by 6X. New SpeedPoint tip provides 6X faster initial penetration time than before, and eliminates the need for center punching. Single-fluted cutting edge assures true round holes, and allows greater control with less vibration. Coating: Titanium Nitride Materials: Steel Drill Bit Range Min: 3/16quot; Drill Bit Range Max: 7/8quot;.