We are committed to providing good quality services, if you have any needs, welcome to consult，we will do our best to meet 。Heavy-Duty keyed chuck for both Hand and Impact drills.Features: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.Widely Use --- Versatile use on impact drills and electric power driver to quickly switch tasks and keep the job moving.Premium Quality --- Constructed from premium carbon steel for durability and stands up to extensive daily use.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.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.Specifications:Material: Carbon SteelPackage Weight: 260g/9.2Package Size: 10*10*4cm/3.9*3.9*1.6inPackage List:1 * Drill Chunk1 * Chunk Key1 * Adapter