Bestgle 1/4 inch Shank Router Collet Chuck Extension Rod for Engraving Machine Bits

Place the router collet extension shank in the 1/4" collet routers, use with all diameters of 1/4" shank bits. Shank diameter: 1/4/ 6.35mm, Hold diameter: 1/4"/6.35mm; Overlength: 3.15"/ 80mm. Allows you to use your router when you need to make deeper cuts, make you more efficient to process. Precision ground to eliminate imbalances, increased stability during cutting, tighten the nut directly. Only accepts 1/4 inch shank bits. Need to tighten with a wrench to prevent the bit from falling off., Manufacturer: Bestgle