Features CEMENTED CARBIDE MATERIAL: Made of premium cemented carbide material, the entension holder is strong and sturdy, not easy to deform. The holder can be used for powerful milling to improve efficiency. FINE WORKMANSHIP: The extention holder is well crafted with fine inner hole, and high concentricity, and extension holder works with premium stability. DEEP HOLE PROCESSING: DC extension holder can bring the milling cutter into the deep hole processing slot for processing, solve the deep hole processing problem for you. WIDE APPLICATION: The extension holder is widely used in CNC lathes, machining centers, tapping machines, drilling machines, milling machines and other equipments. IDEAL REPLACEMENT: The holder is easy to install and dissamble, which is an ideal replacement for the old and damaged parts for better working performance! Specification: Item Type: Mill Extension Holder Material: Cemented Carbide Package List:1 x Extension Holder  1 x Hex Wrench 3 x Screw 1 x Storage Box  Package List 1 x Extension Holder 1 x Hex Wrench 3 x Screw 1 x Storage Box