Feature: 1. Dynamic Balance: This collet chuck have dynamic balance, generally not have, which is more practical than other products 2. Achieve High Speed: Dynamic balance is to increase the speed of the product, the product is normally 7000?8000rpm, can reach 25000?30000 speed after dynamic balance, to achieve high speed 3. Accurate Size and Accuracy: The product is able to keep the size and accuracy accurate under the operation of the lathe 4. Clamp Cutting Tool: The tapered spring collet is gradually contracted during the axial movement (locking) process to realize the clamping of the cutting tool 5. Imperial Size: This ANSI American tool holder with imperial size, which is applicable to many models Specification: Item Type: Collet Chuck Product Material: High speed steel (HSS) Model: CAT40-ER32-2.76in Product Size: 5.447in x 2.5in Product Use: The tapered spring collet is gradually contracted during the axial movement (locking) process to realize the clamping of the cutting tool.. Package List: 5 x Collet Chuck Note: 1. Please make sure that the ER chuck extension is installed correctly. Please note that the extension handle must be firmly fixed; and the chuck nut and extension rod must be tightened.2. Due to manual measurement, please allow a difference of 1?3mm.3. When the tool is inserted into the inner hole of the collet, it must exceed the effective holding length of the inner hole to avoid improper damage.