DRILL CHUCK diameter is 43mm/1.69inch, length is 58mm/2.28inch, connection size is 1/2-20UNF, clamping range is 2~13mm / 0.04~0.51inch. Before purchasing, please confirm compatibility with your hand drill. DRILL CHUCK is self-tightening, durable, and designed for long service life, suitable for extended use. The chuck securely holds drill bits and resists loosening. Compared to traditional chucks, this keyless design allows for easier installation and removal. 2~13MM UNIVERSAL KEYLESS CHUCK offers a wide collet range suitable for various drill bit sizes. Simple to operate, it serves as a practical industrial accessory. KEYLESS HAND DRILL CHUCK features easy installation and removal, providing convenience and cost-efficiency. The keyless, self-tightening design is ergonomically optimized and compatible with multiple drill bit types to meet diverse requirements. HAND DRILL CHUCK securely grips drill bits without loosening. This product is straightforward to use, requiring no complex procedures for operation.