Features:_x000D_ _x000D_ This product is required to be used on a flexible shaft with a detachable handle such as a hanging mill, a table mill, a drill shaft or a table saw. It cannot be used alone. _x000D_ The handpiece chuck is made of stainless steel,durable and has long service life. _x000D_ Good heat dissipation ability makes you can use it longer at a time. _x000D_ The handle is stable and has great performance while using. _x000D_ Professional and practical design with beautiful appearance, easy to carry and use. _x000D_ _x000D_ Specification:_x000D_ Size:0.3~4mm/0.01~0.16in_x000D_ Material:Stainless Steel_x000D_ _x000D_ Package List:_x000D_ 1*Handle_x000D_ 1*Key_x000D_ _x000D_ Note:_x000D_ Due to the high speed operation, the bearing heats up and the handle heats up. After using for 10 minutes, it must be stopped for 2-3 minutes to cool down to avoid overheating of the product, and then use it after the machine has cooled down completely.