Premium Material: Made of high quality material, durable and convenient to use(Please receive the coupon code on the product page when purchasing to get a cheaper price.) Wide Usage: Suitable for automotive manufacturing, mold making, machinery manufacturing, etc. More Safety: Eliminate the dangerous temptation to pull the shank out of the collet, extend the bit to achieve the full depth of cut. Safety Notice: The extension shank should be tight, but the nut of the clamp should only be tightened with the same pressure as any router clamp. Please note that the extension rod should be well cooled, but the collet nut should only be tightened with the same pressure than any router clamp Caution: Make sure the router clamp extension is properly assembled. Please note that the router clamp shank extension cord should be snug, but the clamp nut should only be tightened with the same pressure as any router clamp. Specifications: Material: Hard Alloy Color: Black Stem diameter: 8mm Hold