Keyless Chuck 1/2" x 20 Female Mount: 1/2-20UNF Capacity range: 2-13mm Tool-free accessory Class 3-Jaw Design Heavy-duty construction Durable Keyless Chuck 1/2" x 20 Female This quick change universal chuck constructed with carbon steel and pc plastic, sturdy, and durable for long life. Excellent chuck replacement or upgrade compatible with thousands of model corded and cordless drills. No chuck key needed, simply hold and turn to tighten or loosen chuck, also allows easily locks and releases drill bits. It is suitable for air, electric cordless drills, etc. Features 1/2" x 20 UNF Mounting thread Female Thread Mount High-quality keyless chuck for either replacing broken or damaged chucks or upgrading from a keyed chuck Suitable for drill bits up to 13mm (1/2") Easy to use