BLU-MOL Xtreme 1/4-in Step Drill Bit Set (1/4-in to 1-3/8-in) E0102786

4x faster cutting than standard two fluted step drillsImpact rated for high torque applications1/4 inch quick change hex shank for quick change and no slip drillingM35 cobalt provides strength and durabilitySelf-start dual cutting split point provides engagement and minimizes walkingContinuous cutting action allows for faster, cleaner hole enlargementTitanium nitride coating extends the life of the bitDrills through metal, sheet metal, plastic and stainless steelSpiral design