Item Type: Taper Collet Chuck Holder Material: High Carbon Steel Model: MTB2-ER11 Nut Diameter: Approx. 19mm / 0.75in Rear Thread: M10 Use Collet: For ER11 Handle Length: Approx. 64mm / 2.52in Application Range: Suitable for lathe, drilling machine, milling machine processing Package List 1 x Collet Chuck Holders 1 x Wrench 1. Incorrect assembly may damage the accuracy of the nut and spring2. Only the matching collet chuck can be used to assemble the nut3. Do not clamp tools that exceed the clamping range 1Integral Molding: Clamped at one time, and the inside and outside are Integrally formed. The concentricity is high and not suitable for shaking, has excellent resistance. 2Not Easy to Deform: The surface quenching process increases the hardness of the object, and not easy to deform after long term use 3Link Processing: Unique internal thread design for link processing, and the center joint to lock the cutter head 4Wide Application: Milling chuck can be widely used for lathes, drilling machines, milling machines processing, etc. 5Basic Specifications: The nut diameter is 19mm, the back pull thread is M10, and the shank length is 64mm