slbrillrePremium Material: Made of high quality material, durable and practical to use(Please get the promo code on the product page when purchasing to get a more favorable price.) Wide Usage: Suitable for automobile manufacturing, mold manufacturing, machinery manufacturing, etc. More Safety: Eliminate the dangerous temptation to remove the collet shank, extend the bit to obtain the full depth of cut. Safety Notice: The extension shank must be tightened securely, but the collet nut should only be tightened with the same pressure as any router collet. Please note that the extension shank must be cooled properly, but the collet nut should only be tightened with the same pressure as any router collet. Features: High precision, stable performance. High strength and hardness. Durable in use. Make you more efficient in processing products. Suitable for automobile manufacturing, mold manufacturing, machinery manufacturing, etc. Caution: Make sure the router collet extension is properly assembly. Please note that the extension rod should be tightened securely, but the collet nut should only be tightened with the same pressure as any router collet. Specifications: Material: Hard Alloy Color: Black Shank Diameter: 8mm Hold Diameter:8mm Total Length: 77mm Package Content: 8mm Router Collet Extension