Router collet extension for 8mm shank bits, need to tighten with wrench to prevent bit from falling out.Made of heavy duty steel for long life life, convenient to use.Eliminate the dangerous temptation to pull the shank off the collet, extend the bit to provide the full depth of cut.Make you more efficient to process products, suitable for wood cutting, milling, engraving.Package content : 1 x 8mm Rod Collet Extension.ProductCollet Extension Feature:< /p>This clamp extension is made of industrial grade material, high precision, solid and sturdy for long service life.This router collet chuck provides the extra depth of cut needed for many routing tasks.Easy to use, better to control, it will improve the efficiency of your work. Use it to achieve full depth of cut when machining dovetail flutes, ideal for your woodworking.Extension Specifications Clamp:Material: Hard AlloyBlack ColorStem diameter: 8mmHolding diameter: 8mmOverall length: 87mmPackage Included:1 x Router Clamp ExtensionNote:1. The speed reaches 20000 RMP2. For the higher hardness material, please use 1/2 handle3. Cannot be used for iron products, be careful if there are nails in the board or the like4. Please take protective measures when using