1. This is a precision collet chuck tool holder designed for enthusiasts with needs. 2. The collet should be first installed into the clamping nut and then inserted into the chuck. 3. It is relatively easy to operate and has relatively high work efficiency. 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. 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, it is recommended to stop cutting. 2. The length of the tool protruding from the chuck should be relatively short. If the tool protrusion is relatively long, adjust the rotation speed, feed rate or cutting amount. 3. If abnormal vibration or noise occurs during the cutting process, reduce the spindle speed and cutting depth until the situation gets better. Only the above packaging contents are included, and other items are not likely to be provided. 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 acceptable.