Features 1、Easy and quick to change accessories replacement on multi tool without changing collets. 2、Suitable for most power tools such as electric drill, grinder, screwdriver. 3、Use this chuck to convert any cordless driver or impact driver into a drill or a mill. 4、Unlimited used in car, garages, warehouses, offices, homes, etc. 5、Suitable for electric grinders with spindles of 7mm or 8mm. Not this size can not be used. Specification Features: 1. Easy and quick to change accessories replacement on multi tool without changing collets. 2. Suitable for most power tools such as electric drill, grinder, screwdriver. 3. Use this chuck to convert any cordless driver or impact driver into a drill or a mill. 4. Unlimited used in car, garages, warehouses, offices, homes, etc. 5. Suitable for electric grinders with spindles of 7mm or 8mm. Not this size can not be used. Specification: Condition: 100% Brand New Item Name: Drill Collet Clamping Range: 0.5-3.2mm Total Length: Approx. 18mm / 0.7in Thread Diameter: Approx. 8mm / 0.31in Type: Short-tail, Long-tail (optional) Application: Suitable for electric grinders with spindles of 7mm or 8mm. Not this size can not be used. Package List: 1 * Drill Collet Note: 1. The output shaft diameter of the electric grinder and the flexible shaft that can be matched is 7.9mm. 2. If the casing of the nose part is hollow between the output shaft and the output shaft, the length of the output shaft protruding outside must be greater than 10 mm. 3. If the casing and the output shaft of the nose part are nearly and solid, the length of the output shaft protruding outside must be greater than 13 mm. 4. On the small flexible shaft, the hollow part between the head of the flexible shaft handle and the output shaft must be larger than 13.8mm (some small soft shafts on the market are not suitable, please pay attention when purchasing.) Package List