Metallics BFR20 Masonry Drill Bit, 1/2 in, 3/8 in Straight Shank, Tungsten Carbide Cutting Edge, 6 in OAL Metallics Masonry Drill Bit, 1/2 in Drill Bit, 6 in Overall Length, 2 Flutes, Slow Spiral Flute, 3/8 in Shank, Straight Shank, Carbide Cutting Edge, Carbide, Black Oxide, Applicable Materials: Hard Brick, Sandstone, Bluestone, Terracotta Block and Hard Concrete