Features - This screw chuck is free of hand screws for improved operation safety - Help beginners hit the problem of tilt and tilt when screwing in to improve work efficiency - Small and lightweight, easy to carry - Suitable for bits with handle diameter 6-8mm - Specifications - Material: ABS - Size: 40mm*18mm - Net Weight: 3.2g Package Content: -3 * Screw Notes:1. Manual measurement, please allow 1 - 3mm error, thank you.2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee that the style is the sameAs shown in the picture.