Feature: 1. The clamping range of the CNC tool holder is 1-13mm, and the effective extension length is 2.76in. 2. The clamping accuracy of the tool holder is high, which can ensure the concentricity and balance during processing. 3. The operation is stable and the chip volume is even, and the maximum speed is 8000r/min. 4. Made of 40Cr material, it has toughness and wear resistance, and it is not easy to deform after long-term use. 5. Easy installation and disassembly, stable processing, often used in CNC machining centers. Specification: Item Type: CNC Tool Holder Tool Holder Model: CAT40-ER20-2.76in (CAT40 refers to the tool holder model, ER20 refers to the collet model, 2.76 refers to the effective length of the tool holder is 2.76in) Tool Holder Material: 40Cr Maximum Speed: 8000r/min Tool Holder Accuracy: 0.008mm Application Scope: CNC machining center Whether Coating: Coating Matching Collet: ER20 (not included) Collet Clamping Range: Approx. 1-13mm / 0-0.5in Matching Pull Stud Model: 5/8-11UNC (American thread) (not included) Tool Holder Color: Silver + black. Package List: 1 x CNC Tool Holder Note: 1. Correctly install the pull stud to the end of the handle before use.2. The chuck must first be fixed with a nut, insert the tool, and then lock into the knife body.3. When the tool enters the sleeve hole, the hole must exceed the effective tightening length of the tool to avoid improper locking and damage.