Efficient Projects: Keyless for quick tool changes. Drill chuck adapter with 3-class jaw design holds the drill bit firmly and securely and is not easy to loosen. Universal tool, drill chuck suitable for hand drills, hammer drills, etc. Note: Before purchasing, it is necessary to check whether the connection thread of your electric drill is 1/2-20UNF. (1/2-20 is the definition of the thread specification. Specification: 1/2; Number of threads (T): 20. UNF, UN is the standard code for inch threads, and F is a fine thread.) Features: 【Premium Drill Chuck】: The drill chuck can hold the drill bit firmly, is not easy to loosen, and is durable and robust in use. It is well suited for long working hours and has a long service life. Wide Application: This drill chuck has a wide clamping range from 1.5mm to 13mm, with a 1/2" x 20UNF connection size. It is suitable for many types of drill bits. Reasonable Design: This is a keyless, self-tightening drill chuck. The keyless, self-tightening design is more in line with human engineering. Easy Operation: The hand drill chuck is easy to install and disassemble, saving effort and making it more convenient; no complex operations are required. Durable and Long-Lasting: The self-tightening drill chuck features heat treatment, making it rust-proof even in the worst environments, making it suitable for long-lasting work. The product has good toughness and higher structural strength. Specification: Product Name: Keyless Drill Chuck Color: Shown Material: Steel Clamping Range: 1.5-13mm Connection thread: 1/2" x 20UNF Chuck size: approx. 71 x 43mm Package list: Keyless drill chuck [1/2" x 20 UNF] 1/4 HEX adapter [1/2" x 20 UNF] SDS Plus adapter [1/2" x 20 UNF] 1/2" impact driver adapter [1/2" x 20 UNF]