Item Type: Tapping Collet Model: GT24-ISO-M18 Material: High speed steel Specification: M18 M18 Suitable Tap Size: Shank Diameter x Square: Approx. 14 x 11.2mm / 0.6 x 0.4in Uses: Widely used in tapping machines, drilling machines, milling machines, boring machines, electric tools, pneumatic tools and other equipment with reversible spindles How to Use: 1. Press the knurled position of the handle body with the thumb of your left hand and pull it in the direction of the arrow 2. The handle body is aligned with the concave and convex keys of the chuck, install the chuck into the shank body 3. When disassembling the chuck, pinch the knurled key with your hand and pull the chuck back and it will be ejected automatically Install Steps: 1. Thumbs press down the spring 2. Put the tap into the chuck hole and release your thumb