Features 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