Heavy-Duty keyed chuck for both Hand and Impact drills. Features: Easy and Fast Change --- Quick-change 1/4 inch hex shank for electric drill convert impact driver to hold non-quick change drill & driver bits instantly. Firmly Hold --- Classic keyed 3-jaw design securely holds a wide range of twist drills conveniently and step drill bits with 1/16" to 3/8" shank. Premium Quality --- Constructed from premium carbon steel for durability and stands up to extensive daily use. Widely Use --- Versatile use on impact drills and electric power driver to quickly switch tasks and keep the job moving. Full Equiped --- This complete power tool conversion kit includes keyed 3/8 drill chuck, a chuck key and a 1/2 Dr. x 1/4 Hex adaptor. Note: Color sent randomly. Specifications: Material: Carbon Steel Package Weight: 260g/9.2 Package Size: 10*10*4cm/3.9*3.9*1.6in Package List: 1 * Drill Chunk 1 * Chunk Key 1 * Adapter