ITEM NAME:R8 ER20 7/16 inch Collet Chuck Holder CNC Milling Lathe R8 Arbor Spindle Ho G4H9 R8 ER20 7/16 inch Collet Chuck Holder CNC Milling Lathe R8 Arbor Spindle Ho G4H9 100% Brand New. R8 shank Holding all ER16 collets. Clamping from 1mm-10mm. Straight shank type extended handle, the handle body was longer, applicable to deep hole processing, resolve to extend the depth of processing needs. The nut can direct rotation tighten, high rigidity and strong clamping force. Color: silver + black material: metal Model: R8 ER20 Drawbar Thread: 7/16 inch Overall Length: 143mm (5.63 inch) Shank diameter: 24mm (0.94 inch) Collet chuck Model: ER20 (Cap was Hexagonal type) Maximum clamping: 10mm ( 0.39 inch) Run-Out Tolerance 0.01mm (0.0005 inch) Package included: 1 x Straight Collet Chuck Holder Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Model: R8 ER20. Collet chuck Model: ER20 (Cap was Hexagonal type). 1 x Straight Collet Chuck Holder. R8 shank Holding all ER16 collets. Clamping from 1mm-10mm. The nut can direct rotation tighten, high rigidity and strong clamping force.