FEATURES & BENEFITS: longer bit life provided by vacuum brazed carbide inserts dust removal, a result of optimized fluting, provides for speedy drilling time, reduced heat and bit wear chromium, nickel, molybdenum steel body allows for the maximum impact to be transferred to the cutting head allowing for the greatest drilling capacity 3/16-in x 6-in High-speed Steel Round Hammer Drill Masonry Drill Bit for Concrete HD (Heavy Duty) Straight Shank Carbide Bits are designed for use in a hammer drill equipped with a 3 jaw Jacobs type chuck. Round Shank fits all hammer drills with 3-jaw chuck Carbide Tip design removes dust fast for long life Copper braze material gives high heat resistance Shot-peened, double tempered finish reduces breakage Chrome Vanadiam Spring Steel Shaft