Item Type: Collet Chuck Holder_x000D_ Model: SL20-ER20-80L_x000D_ Material: High speed steel_x000D_ Purpose: CNC lathe, milling machine, drilling machine_x000D_ Shank Diameter: Approx. 20mm / 0.8in_x000D_ Adapter Chuck: Approx. 20mm / 0.8in_x000D_ Handle Length: Approx. 80mm / 3.1in 1ER straight rod type extended collet shank, longer shank is suitable for deep hole processing 2Can reduce the use of lengthened tools, reduce costs and improve efficiency 3The nut is directly tightened, with high rigidity and strong holding force 4The outer diameter of the extension rod and other parts are accurately ground to eliminate the imbalance and increase the stability during cutting 5Can be used for CNC lathes, milling machines, drilling machines 1 x Collet Chuck Holder 1 x Bolt