It is made of high-quality alloy steel, has excellent clamping ability and good wear resistance, and can provide stable performance during use. This 1/2-20UNF, 1.5-13mm self-tightening keyless drill chuck. No need to use the chuck key, there be a ratchet sound prompt when turning the drill chuck, which is extremely easy to operate. It is a practical drill chuck tool that can improve work efficiency. Equipped with a 3/8" to 1/2" drill chuck adapter, it can seamlessly use a variety of shanks including 3/8" SDS-Plus and 1/4" hexagonal shanks, thereby maximizing the versatility of the tool. The 1/2-20UNF thread size and the clamping range of 1.5mm to 13mm make this keyless chuck suitable for most electric drills. Product : Material: Chrome steel & alloy Size: 7.5 x 4.3 cm Clamping Range: 1.5-13mm Mount Type: 1/2-20UNF thread 1x 13mm Metal Keyless Chuck 1x Impact Wrench Adapter 1x Round Shank Adapter 1x 6.35mm (1/4") Hex Adapter 1x Square Shank Adapter 2x Rubber Rings 2x Whistles (Bonus) Color: As shown Package Contents: 1*set keyless drill chuck Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.