ITEM NAME:3x Woodworking Router Bit Chuck Collet Adapter Split Milling Cutter Holder Description: Chuck head size: 8mm/6.35mm/6mm (0.31inch/ 0.25inch/ 0.24inch). High Precision Electric Router Milling Cutter Woodworking Collet Chuck Head. Adopted high quality steel material, good flexibility and wear resistance. Portable, high precision, tight and stable clamping, improve work efficiency. Suitable for engraving machine, wood router. perfect woodworking tool. Size Chart: Size: approx. 2 x 1cm/ 0.79 x 0.39inch Package Includes: 1 Piece 8mm Milling Cutter Chuck Head 1 Piece 6.35mmMilling Cutter Chuck Head 1 Piece 6mm Milling Cutter Chuck Head Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you! DMO0015573519532916.Perfect woodworking tool. 1 Piece 8mm Milling Cutter Chuck Head. 1 Piece 6mm Milling Cutter Chuck Head. 1 Piece 6.35mmMilling Cutter Chuck Head. Size Chart.