Features 1、Cast by high quality stainless steel, anti-impact and anti-corrosion. 2、The clamping jaws are specially treated to improve wear resistance. 3、Fine workmanship ensures its stable performance and long service life. 4、Equipped with chuck key to adjust the chuck to proper tightness. 5、Easy to mount, applicable to electric drill, electric grinder, etc. Specification Features: Cast by high quality stainless steel, anti-impact and anti-corrosion. The clamping jaws are specially treated to improve wear resistance. Fine workmanship ensures its stable performance and long service life. Equipped with chuck key to adjust the chuck to proper tightness. Easy to mount, applicable to electric drill, electric grinder, etc. Specification: Clamping range: 0.3-4mm Connection size: JT0 Package list: 1 * Drill Chuck 1 * Key Package List