Collet extension for 8mm shank bits, must be tightened with a wrench to prevent the bit from falling off. Made of durable steel for a long service life, practical to use. Eliminate the dangerous temptation to pull the shank out of the collet, lengthen the bit to provide the full depth of cut. Make the processing of products more efficient, suitable for woodworking, milling and engraving machines. Included: 1 x 8mm Stock Collet Extension Collet extension function: This collar extender is made of industrial grade material, high precision, strong and sturdy for long lasting durability. This router collet provides the extra 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 teeth, ideal for your woodworking needs. Collet extension specifications: Material: hard alloy Color: Black Shaft diameter: 8 mm Holding diameter: 8 mm Overall length: 87mm Scope of delivery: 1 x router collet extension Note: 1. The speed reaches 20000 RMP 2. For the higher hardness material, please use 1/2 grip 3. Cannot be used for iron products, pay attention to whether there are nails in the board or similar 4. Please take protective measures when using