DEWALT DW5440 1 2" X 16" X 18" Rock Carbide SDS+ Drill Bit SBD Flexvolt and a laser heat treated mating Size:1 5 16" and a laser heat treated mating edge makes this the only crimper you’ll ever need The DWE402 4 1 2 inch (115mm) Small Angle Hand Grinder features three powerful systems for maximizing performance such as the Dust Ejection System for preventing damaging dust from entering the grinder tool Aggressive material removal: Two stage flute design with variable helix pattern of DEWALT SDS hammer drill bits allows for efficient debris removal An innovative bonding system attaches the tip to the flute and ensures that the bit will last