Description The DWA1400 collection is designed for end-users creating and repairing internal threads in metal applications. DEWALT Taps are machined from high carbon steel for precise threading. The Black Oxide drill bits, designed for long life and durability, feature a patented core diameter which helps to reduce breakage.Black oxide split point drill bitFor use creating or repairing internal threads in metal applicationsHigh carbon steel tapIdeal for precise threadsPatented core diameter reduces breakage