Premium Material: Made of high-quality materials, durable and very practical. Wide Applications: Suitable for automobile manufacturing, mold manufacturing, machinery manufacturing, etc. Improved Safety: Prevents dangerous removal of the collet shank and extension of the tool to achieve full cutting depth. Safety Warning: The extension rod must be tightened, but the tightening force of the collet nut must be the same as the tightening force of each milling chuck. Please note that the extension rod must be fully cooled, but the tightening force of the collet nut must be the same as the tightening force of any milling chuck. Note: Make sure the milling chuck extension rod is installed correctly. Please note that the extension rod must be tightened, but the tightening force of the collet nut must be the same as the tightening force of each milling chuck. Specifications: Material: Carbide Color: Black Shank Diameter: 8 mm Fixture Diameter: 8 mm Total Length: 86 mm Contents: 8 mm milling chuck extension rod Weight: 84 g Package Quantity: 1 piece