1、Stable for Works: Finely ground inner hole has high concentricity, which also has smooth thread for firm clamping as well as good stability and rigidity. 2、Smart Processing: The extension rod can bring the milling cutter into the deep hole processing slot, largely improving the processing accuracy and effect. 3、Wide Application: Widely applied on CNC lathes, machining centers, tapping machines, drilling machines, milling machines and other equipment operations. 4、Carbide Material: Adopting premium cemented carbide material with high hardness, strength and tenacity, very durable with heat, corrosion and long using. 5、Quick to Install: Suits perfectly for strong milling, this router collet extension rod with a light weight and a compact is very convenient to install.