3/16 x 3-1/2" Tapcon Carbide Masonry Drill Bit, 11257 ITW Brands

Precise drilling for optimal performance. Carbide-tipped bits are strong and durable. Tighter bit tolerance provides maximum anchor performance. Use a 3/16" drill bit to install 1/4" Tapcon anchors. Diameter: 3/16", Length: 3-1/2", For use with fastener diameter: 1/4", For use with fastener length: 1-1/4" to 1-3/4".