Gasea 1/4 Inch Shank Bits Router Collet Extension Chuck Rod Engraving Machine

Note: Only accepts 1/4 inch shank bits. Need to tighten with a wrench to prevent the bit from falling off. Made of heavy-duty steel, can be used for clamping 1/4 Inch shank drill,milling cutter, straight shank tool. Shank diameter: 1/4/ 6.35mm, Hold diameter: 1/4"/6.35mm; Overlength: 3.15"/ 80mm. Eliminates the dangerous temptation to withdraw the shank from the collet. Extend the bit to provide the full depth of cut. Suitable for automobile manufacturing, mold manufacturing, machinery manufacturing and so on.