Features ALUMINUM ALLOY: Ultrasonic grinding machine is made of aluminum alloy material, more fine workmanship, more comfortable to hold FLUENT OPERATION: Multiple bearings are installed inside, with strong stability, unhindered operation and strong motor power FILTER: The air inlet of is equipped with a filter mesh to prevent foreign matter from entering the movement and damaging CONVENIENT TO USE: Adjust the fan speed by adjusting the size of the air inlet, cylindrical design, and is easy to use LABOR TIME SAVING: Made with accuracy craftsmanship and has lightweight body, which is light, labor saving and time saving Specification: Item Type: Air Pencil Grinder Kit Material: Aluminum Alloy Model: BC-08K Speed: 32000rpm Collet: Approx. 3mm / 0.12in Uses: Commonly used for jades carving, glass manufacturing, wood carving, etc. Package List:1 x Air Pencil Grinder Kit1 x Flat Collet 1 x Collet 1 x Connector 1 x Sponge Cover 1 x Hex Wrench1 x Gas Tube  Note:Please wear protective glasses when using pneumatic tools to avoid the powder from using pneumatic tools to damage the eyes.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 1 x Air Pencil Grinder Kit 1 x Flat Collet 1 x Collet 1 x Connector 1 x Sponge Cover 1 x Hex Wrench 1 x Gas Tube