Bosch Flat Shank Hex Masonry Drill Bits

5/32" drill bit is for use with 3/16" diameter mason screws  (3/16" masonry screws come standard with all Habitat Haven window enclosures) 3/16" drill bit is for use with heavy-duty 1/4" diameter mason screws  (1/4" masonry screws are sold separately for specific cases where additional anchoring is needed or where the structure being fastened to has a lower integrity outer layer of stone/cement/brick) High-quality carbide tip for long life Flat shank prevents bit slippage For use with masonry fastening systems/hex sleeve drive tools Hex drive on bit fits into driver sleeve For applications in brick, concrete and block Material Carbide Finish Type Titanium Shank Type Hex Brand BOSCH Surface Recommendation Alloy Steel