Key Features Build to Last: This collet set is made of premium spring steel with quenching and hardening processes, making it strong, high-strength, heat-resistant, corrosion-resistant, anti-rust, and reusable. High Accuracy: With precision manufacturing, it has high machining accuracy&concentricity, and can ground to 0.0008-inch flatness. Good Clamping Effect: With more teeth to enhance the flexibility of the collet and the spring steel material, this collet set has large elasticity and tight clamping with a range of 0.16-1.02inch. Considerate Design: The built-in self-release design of these collet chucks allows for fast and smooth removal to shorten the replacement time and make your work more efficient. The clamping head&tail chamfering work ensure easy clamping without much effort. Storage Box Equipped: The wood storage box with sponge liner allows for easy storage of these collet chucks and gives great protection for them. Application It is suitable for all kinds of CNC and engraving machine equipment and is ideal for milling operation, boring operation, drilling operation, tapping operation, and so on. How to Install 1. The groove of the spring collet is installed in the eccentric circle of the nut. Push the spring collet until it clicks, indicating that the spring collet has been installed in place. 2. Then install the spring collet with the tool. 3. Install the nut onto the handle and lock it with a wrench. How to Disassemble 1. Unscrew the nut from the handle and pull out the tool. 2. Push inward from the front of the spring collet and press downward against the bottom of the eccentric circle at the same time, and push the spring collet diagonally until the spring collet and nut are separated. Specifications Model: MTB4-ER40 M16 Color: Silver, Black, Red Material: 65Mn Spring Steel Shape: Round Feature: Durable Compatible Devices: Milling/Drilling Machine, Lathe Number of Collet Chucks: 23 Accuracy: About 0.02mm/0.0008inch Spindle Drawbar Thread: M16 Collet Chucks: 4-26mm/0.16-1.02inch Package Size: 42*26*11cm/16.5*10.23*4.33inch Net Weight: 7.5kg/16.5lbs Gross Weight: 8kg/17.6lbs Package Included 1* MTB4-ER40 Chuck Shank 23*Collet Chucks 1* Wrench 1* Box   Notes 1. Please make sure the model and size are what you need before purchasing. 2. When doing processing work with this product, please pay attention to your safety. 3. Incorrect assembly may affect the accuracy of the spring collet. Please use the matched spring collet to assemble the nut. Do not clamp tools beyond the clamping range. Please insert the tool as far as possible into the clamping length of the spring collet to achieve better results. The insertion length of the tool shall not be less than 2/3 of the clamping length of the spring collet. Incorrectly inserting the tool may deform the spring collet and lead to poor radial jump error and tool fracture.