Feature: 1. Internal cooling through hole and the central through hole design, conducive to water cooling 2. Anti‑vibration and more anti‑bending, helps for reducing the use of long knives 3. Advanced vacuum quenching furnace can realize carbon and oxygen co‑permeation to increase the hardness of the tool shaft and enhance the lifespan 4. Hex nut is convenient for clamping, loading and unloading more convenient, possess high rigidity, strong clamping force 5. Can allow you to reduce the use of lengthened tools, good for reducing costs and improving efficiency 6. UM type ER extension rod is tightly fitted with fine teeth. The size of ER chuck used for mounting is different, and the size of nut is also different 7. Accurately ground outer diameter of the extension rod and other parts, eliminate the imbalance and increase the stability during cutting Specification: Item Type: Collet Chuck Holder Model: SL32-ER25-80L Material: High speed steel Purpose: Lathes and various machining centers Shank Diameter: Approx. 25mm / 1in Handle Length: Approx. 80mm / 3.1in Adapter Chuck: Approx. 32mm / 1.3in Scope of Application: CNC lathe, milling machine, drilling machine. Package List: 1 x Collet Chuck Holder