Features: 1. High precision electric router cutter woodworking collet chuck head. 2. Adopted high-quality steel material, good flexibility and wear resistance. 3. Portable, high precision, tight and stable clamping, improve work efficiency. 4. Feeding head size: 8mm, 6.35mm, 6mm (0.31", 0.25", 0.24") 5. Suitable for engraving machine, wood router. Perfect woodworking tool. Specifications: Material: Hard metal alloy. Colour: As shown in the picture. Chuck head size: 8mm, 6.35mm, 6mm Package list: 6 x Collet adapters. 2 x Collet nut Note: 1. Due to different factors, light, shooting angle, display colour difference, product images are for reference only. 2. Please allow for slight measuring errors due to manual measurement.