This handpiece allow you change out accessories (Such as burs, bits, drills and cutters etc. with) easily. You do not need to use chunk key or pin or wrench,Just a momentary interruption in your work. There have got a level mechanism on the handpiece body,It can help you open it quickly and smoothly. This item also with the features of low vibration and slowly heating when working,Suitable for grinding, drill, mill and other supporting use. Common used in processing of Jewelry and crafts,Adopting high quality metal material, smooth surface,Cabinet and delicate and comfortable using. Jewelry Tools and Equipments Type: Tool Set Product Features: Common used in processing of Jewelry and crafts Item Type: Jewelry Tools and Equipments Specification: Quantity: 1 Pc Colour:BlackandSilver Material:metal Size:14.2cm Package Contents: 1 x Crane engraving head handle Only the above package content, other products are not included. Note: Light 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.