Router Collet Extension for 1/4 Inch Bits, 1/2 Inch Bits, 8mm Shank Bits; Need to tighten with a wrench to prevent the bit from falling off. Made of heavy-duty steel for long life use, practical to use. Eliminate the dangerous temptation of withdrawing the shank from the collet, extend the bit to provide the full depth of cut. Make you more efficient to process products, suitable for woodworking trimming, milling, engraving machine. Package Including: 1 x 1/4 Inch Router Collet Extension, 1 x 1/2 Inch Router Collet Extension, 1 x 8mm Router Collet Extension. Collet Extension Feature: This collet extender is made of industry grade material, high precision, strong and sturdy for long life. This router collet chuck provide the additional depth of cut needed for many routing tasks. Easy to use, better to control, it will improve your work efficiency. Use it to achieve full depth of cut when machining dovetail splines, ideal for your woodworking. <b>Collet Extension Specifications:</b> Material: Hard Alloy Color: Black <b>Package Included:</b> 1 x 1/4 Inch Router Collet Extension 1 x 1/2 Inch Router Collet Extension 1 x 8mm Router Collet Extension <b>Note:</b> 1. Can not be used for iron products, pay attention to whether there are nails in the board or the like 2. Please take protective measures when using