1. This is a "brand - new" precision collet chuck tool holder specially designed for enthusiasts with needs. 2. The collet must be first installed into the clamping nut and then inserted into the chuck. 3. It is easy to operate and highly efficient in work. Specifications: 1. Model: R8 - ER32 2. R8 spindle 3. Drawbar thread: 7/16 4. ER32 clamping range: 1 - 20 mm 5. Wrench: 1 piece, size 45 - 52 6. Applicable machine model: R8 special - purpose machine tool 7. Color: Silver + Black 8. Material: Metal 9. Size: 16 cm (6.3 inches) Packaging contents: 1 milling chuck extension rod Precautions: 1. When using this tool, measure the tool run - out. If the tool run - out accuracy exceeds 0.01 mm, stop cutting. 2. The length of the tool protruding from the chuck should be as short as possible. If the tool protrusion is too long, adjust the rotation speed, feed rate or cutting amount by yourself. 3. If abnormal vibration or noise occurs during the cutting process, reduce the spindle speed and cutting depth until the situation improves. Only the above packaging contents are included, and other items are not. Note: Light and different displays may cause slight differences between the color of the item and the actual one. A measurement error of +/- 1 - 3 cm is allowed.