SDS bits have carbide vacuum brazed to heat-treated steel shanks. The sharpened angle of the carbide creates 2 cutting edges. The flute of the bit is designed for fast removal of the concrete dust from the hole, aiding in more efficient drilling of small holes. 1/4" hex shoulder for Tapcon screw system. No. 48-20-7091: Diameter: 5/32 In., Length: 7 In., Flute Length: 4 In., Cutter Geometry: 2-Cutter, Material: Carbide, Pkg Qty: 1, Package Type: Hang Tag No. 48-20-7092: Diameter: 3/16 In., Length: 7 In., Flute Length: 4 In., Cutter Geometry: 2-Cutter, Material: Carbide, Pkg Qty: 1, Package Type: Hang Tag