Description: 7/16 Collet Chuck Holder + 6pcs Collet CNC Milling Tool.    Specifications: Size:16cm/6.3 inch;  Spindle:R8 spindle;  Drawbar thread:7/16;  Precision:0.01;  Clamping range:1-20mm;  Suitable For:R8 dedicated machine.    Collet Size: Material: High Grade 45 Carbon Steel;  Size:40 x 33mm;  Clamping Diameter:3mm(1/8") / 6mm(1/4") / 10mm(3/8") / 13mm(1/2") / 16mm(5/8") / 19mm(3/4");  Quantity:6pcs.    Features: - Straight extension rods, shank body longer for deep hole machining.  - Straight-type handle body, for holding small drilling, milling tools.  - You can reduce the use of longer tools, which can reduce costs, improve efficiency.  - Stability diameter, and other parts have been precision ground to eliminate unbalance.  - Durable, high precision, tighten the nut straight, high rigidity, strong clamping.  - Collet must be assembled into the clamping nut before inserting into the chuck.    Note: 1. Before using this tool, please measurement tool deflection, tool deflection accuracy exceeds 0.0005", please correct before cutting.  2. The tool extends the length of the chuck as short as possible, the tool extends the amount of time longer 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 improve the situation so far.  The correct methods of mounting the collet nut: 1. Put the chuck into the pressure cap, gently turn the clamp spring, when eccentric portion of the pressure cap recessed clamp spring groove. Along the arrow direction and use equal force to push clamp spring, can mount pressure cap.  2. Put the clamp spring and cap all together installed on the chuck body or spindle. Insert into the clamping hole after wipe the cylindrical shank, use a wrench to tighten the pressure cap, until clip firmly the tool before use.  (Note : Avoid fastening pressure cap that not installed tool, to avoid damage the clamp spring).  3. Use a wrench to loosen the pressure cap and took out the chuck or tool, remove the tool. Along the direction of the arrow push out the clamp spring. Then according to need replace other clamp spring.    Packing Included: 1pc x Holder;  6pcs x Collet