A. This is a precision collet chuck tool holder designed for enthusiasts with needs. The collet must be first installed into the clamping nut and then inserted into the chuck. It is easy to operate and efficient in work.B. Specifications:1. Model: R8 - ER322. R8 spindle3. Drawbar thread: 7/164. ER32 clamping range: 1 - 20 mm5. Wrench: 1 piece, size 45 - 526. Applicable machine model: R8 special - purpose machine tool7. Color: Silver + Black8. Material: Metal9. Size: 16 cm (6.3 inches)C. Packaging contents:1 milling chuck extension rodD. Precautions:1. When using this tool, measure the tool run - out. If the tool run - out accuracy exceeds 0.01 mm, it is advisable to stop cutting.2. Try to keep the length of the tool protruding from the chuck as short as possible. If the tool protrusion is long, you may 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 improves.Only the above - mentioned packaging contents are included, and other items are not. Note that 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.