ApplicableInstallation and modification of engraving machines, milling machines, milling cutters and wood milling engraving heads, increasing the range of use of stationary engraving heads. Material High precision round head electric milling cutter for woodworking. Using high speed steel, it has good flexibility and wear resistance. High-precision electric planer and woodworking collet chuck can provide you with excellent results. ConveniencePortable, high-precision, tight and stable clamping, which improves efficiency work. Package includesThere are three sizes in total, 6mm, 6.35mm and 8mm. Three specifications of chuck heads can meet different requirements. The weight is approx. 5g/pc. Customer ServicePlease feel free to contact us if you have any questions about the products or the purchase, we will reply you soon and provide you with satisfactory service. Features: Tight and stable clamping. Flexible, wear-resistant and durable. Help ideal for improving work efficiency. Suitable for automotive manufacturing, mold making, woodworking tools. Specifications: Material: High Speed Steel Router Collets Size: 8mm / 6.35mm / 6mm (0.31 inch / 0.25 inch / 0.24 inch). Warm Notice: 1. Due to manual measurement, there may be an error of 0-3mm. 2. The color shown in the picture may not be totally the same with the actual item due to shooting method and display device, 3. Please make sure you do not mind before purchase, thank you! Package includes: 2 x 6mm Router Clamps 2 x 6.35mm Router Clamps 2 x 8mm Router Clamps