Heavyduty keyed 3jaw impact chuck — , Key benefits Built for durability: heavyduty design with special quenching treated key parts increases durability and provides strong impact resistance for demanding jobsite use. Secure bit holding: keyed 3jaw design securely holds twist drills and step drill bits, preventing slippage under load. Broad bit compatibility: accepts drill shank sizes from 1/16inch to 3/8inch, covering most common twist and step drill bits. Impactready interface: made for use with a 1/2inch impact wrench; the 3/8inch keyed chuck lets you lock and release bits quickly to stay productive on the job. Features and performance Positive keyed tightening for reliable torque transfer and reduced bit wobble compared with friction chucks. Heattreated key components resist wear and impact damage, extending service life in torque applications. Compact, straightforward design for easy installation on a 1/2inch impact wrench. Typical applications Metal fabrication and sheetmetal work: use with step drill bits to make clean holes in thin steel or aluminum. Automotive and maintenance: drill pilot holes or enlarge mounting holes while the keyed chuck keeps bits secure under impact. Construction and contractor work: install fasteners or prepare holes in framing and hardware tasks where quick, reliable bit changes are needed. What's included / condition , keyed 3jaw 3/8inch chuck designed for use with a 1/2inch impact wrench. Accepts 1/16'–3/8' bits. Usage notes Use the chuck key to fully tighten bits before applying impact torque. Match bit size to the 1/16'–3/8' range for safe operation and performance.