This is a "brand new" precision collet chuck holder for professionals and demanding hobbyists. The collet must be assembled into the clamping nut to insert it into the chuck. Ease of use and high-quality working results. Specifications Model: R8-ER32 R8 spindle of drawbar: 7/16 ER32 clamping range: 1-20mm 1 x 45-52 spanner / wrench Suitable for: R8 dedicated machine up to. Color: Silver + black Material: metal Size: 16 cm / 6.3 inches Package Contents: 2 x bar set Milling Chuck Extension Note 1. Before using this tool, please measure the tool deflection, the tool deflection accuracy exceeds 0.01MM, please correct the cutting. 2. The tool extends the chuck length as short as possible, the tool extends the life longer if it is extended, please cut their own speed, feed rate or cut the amount. 3. If the cutting vibration or abnormal noise, cut the spindle speed and depth of cut to improve the situation Only the above package content, other products are not included. Note: Light shooting