Premium Material: Made of high-quality material, durable and convenient to use. Wide Usage: Suitable for automotive manufacturing, mold making, machinery manufacturing, and other applications. More Safety: Helps prevent the collet shank from being pulled out, allowing the bit to achieve full cutting depth. Safety Notice: The extension shank must be securely fastened. The collet nut should be tightened with the same pressure as used for any router collet. Ensure proper cooling of the extension rod during operation. Attention: Ensure the router clamp extension is correctly assembled. The extension rod must be securely tightened, and the collet nut should be tightened with the same pressure as a standard router collet. Specifications: Material: Hard Alloy Color: Black Stem Diameter: 8mm Hold Diameter: 8mm Overall Length: 86mm Weight: 84 grams Quantity: 1 piece