Features: 1. Precision Engineering: Crafted from high-quality 40Cr steel for exceptional durability and robustness. 2. Secure Clamping: Employs a unique internal thread design in the MTB rear pull-type system to securely lock the cutting head to the machining center joint. 3. Enhanced Hardness: Features a stable build and high hardness, further enhanced by a surface hardening process for long-lasting performance and resistance to deformation. 4. Wide Application: Suitable for a broad range of machining operations on lathes, drilling machines, and milling machines. 5. Superior Replacement: A versatile replacement for standard wrench-type drill chucks, 7316 milling chucks, and B-ER milling chucks. Offers high accuracy, a wide clamping range, and strong clamping force. Specification: Item Type: CNC Milling Tool Holder Model: MTB3-ER32(M12) Material: 40Cr Purpose: Used for operations on CNC machine tools, etc. Hardness: HRC45-48 Handle Length: Approx. 85 mm / 3.3 in Diameter of Large Head on Tapered Handle: Approx. 24 mm / 0.9 in Modular Tapered Handle: MTB3 Tail Thread: M12x1.75P Suitable Nut: ER32 Applications: Suitable for lathes, drilling machines, milling machines, and boring machines. Ideal for threading, drilling, and milling operations.