Features 1、The product matching ER, adopt excellent 40Cr material, which is sturdy and durable 2、MTB rear pull type adopt unique internal thread design is used to link the machining center joint to lock the cutter head 3、The processing is stable and the hardness is high, the surface quenching process increases the hardness of the object for a long time, and it is not easy to deform when used 4、Come with wide processing range, suitable for lathe, drilling machine, milling machine processing 5、This holder can widely replace ordinary wrench type drill chuck, 7316 type milling chuck, and B‑ER type milling chuck. Possess high accuracy, wide clamping range and large clamping force Specification Item Type: CNC Milling Tool Holder Model: MTB5-ER32(M20) Material: 40Cr Purpose: Used for operations on CNC machine tools, etc. Hardness: HRC45-48 Handle Length: Approx. 185mm / 7.3in Diameter of Big Head of Taper Handle: Approx. 35mm / 1.4in Modular Taper Handle: MTB5 Tail Thread: M20x2.5P Applicable Nut: ER32 Features: Can widely replace ordinary wrench-type drill chucks, 7316 milling chucks, and B-ER milling chucks. Possess high accuracy, wide clamping range and large clamping force. Scope of Application: Suitable for lathes, drilling machines, milling machines, and boring machines. It is the first choice for taps, drills and milling cutters. Package List 1 x CNC Milling Tool Holder