Premium Material: Made of high quality material, durable and convenient to useWide Usage: Suitable for automobile manufacturing, mold making, machinery manufacturing, etc. More Safety: Eliminate the dangerous temptation to pull out the collet shank, extend the bit to achieve the full depth of cut. Safety Notice: The extension shank should be tight, but the collet nut should only be tightened with the same pressure as any router collet.Please note that the extension rod should be well cooled, but the collet nut should only be tightened with the same pressure as any router colletFeatures:High precision, stable performance.High strength and hardness.Durable in use.Make you more efficient to process products.Suitable for automotive manufacturing, mold making, machinery manufacturing, etc.Attention:Make sure that the gripper extension of the router is properly assembled.Please note that the extension rod should be tightened snugly, but the collet nut should only be tightened with the same pressure as any router clamp.Specifications:Material: Hard Alloy Color: Black Shank Diameter: 8mmHold diameter:8mmTotal length: 86mmContent:8mm Router Neck Extension Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical item received.