Product specifications: 1. Material: brass; 2. Packing: 1 set (pack of 10pcs) 3. Size: Clamping diameter: 0.5mm/0.8mm/1.0mm/1.2mm/1.5mm/1.8mm/2.0mm/2.4mm/3.0mm/3.2mm (0.02''/0.03''/0.04'' /0.047''/0.06''/0.07''/0.08''/0.09''/0.12''/0.13'') Total length: 17mm / 0.66'',outer diameter of the Shank: 4.3mm/0.17'', inner diameter: 3mm/0.12'' Application: 1. Suitable for installing drills, electric grinders, hanging mills, hoses, etc. 2. Compatible with most rotary tools such as hardware, hobbies, and home. 3.Change the clamping capacity of the electric grinder and solve the blind zone of the clamping path. Its head is 4 claws, and the holding accessories are more stable. Choose from a wide range of sizes, suitable for more material sanding, to meet your multiple needs at once. Note: 1. Since it is a manual measurement, please allow a little error. 2. It is recommended to see if the product is what you need before purchasing, and check whether the inner diameter of the original tool matches the diameter of the product, otherwise it will not match. If you have any questions about quality, please feel free to contact us, thank you.