?Material? Adopted high quality steel material, good flexibility and wear resistance. ?Function? Portable, high-precision, tight and stable clamping, improve work efficiency. ?Application? Suitable for engraving machine, wood milling cutter, trimming engraving machine, etc. ?Size? 8mm / 6.35mm / 6mm (0.31 inch / 0.25 inch / 0.24 inch). ?Delivery? 6 pieces of router collets (2 pieces per size). Description: Good flexibility and wear resistance High-precision electric milling chuck for woodworking Fine workmanship, stable performance Material: carbon steel Quantity: 6 pieces Size: 8mm / 6.35mm / 6mm Delivery: 6 X collet adapters (2 pieces per size) Note: 1. Due to various factors, light, shooting angle, display color difference, product pictures are for reference only 2. Due to manual measurement, please allow some measurement errors.