This is a "brand new" precision collet chuck holder for and hobbyists demanding. Collet must be assembled into the clamping nut inserting into the chuck. Ease of operation and high work results. Specifications Model: R8-ER32 R8 spindle Drawbar thread: 7/16 ER32 clamping range: 1-20mm Spanner/wrench1X 45-52 Suitable For: R8 dedicated machine so . Color: Silver+black Material: metal Size: 16cm/6.3 inch Package Contents: 1 x milling chuck extension bar Note 1. using this tool, please measurement tool deflection, tool deflection accuracy exceeds 0.01MM, please cutting. 2. The tool extends the length of the chuck as short as possible, the tool extends the amount of time if extended, please cut their own speed, feed rate or cutting the amount. 3. If the cutting of abnormal vibration or sound, cut spindle speed and depth of cut to the situation Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.