General description This 1/2-20UNF Keyless Drill Chuck features a clamp range of 1.5mm to 13mm in diameter, ensuring a tight and sturdy grip on drill bits. Its keyless and self-tightening design allows for quick loosening or tightening by hand, making it easy to change drill bits and saving time and energy. Technical specifications Connection Size: 1/2-20UNF Clamp Range: 1.5mm to 13mm Adapters: 3/8inch to 1/2inch Keyless Drill Chuck Adapter, Socket Square Converter Compatible Shanks: 3/8inch SDS-Plus and 1/4inch Hex Shank Measurement allowed error: +/- 1-3cm Compatibility and accessories Compatible with most electric drills Includes 1 x impact drill adapter kit Installation Easy to install with carbide tipped jaws that lock onto bits while minimizing wear Usage Ideal for various drilling applications Maintains long-lasting performance even under heavy use Other information Color may vary slightly due to light reflection and different displays