Description R8 ER20 7 16 Collet Chuck Holder CNC Milling Lathe R8 Arbor Specification ModelR8 ER20Material40cr chrome molybdenum alloy steel Drawbar Thread7 16Overall Length143mm 5 63 Shank diameter24mm 0 94 Collet chuck ModelER20 Cap was Hexagonal type Maximum clamping10mm 0 39 Run Out Tolerance0 01mm 0 0005 Features 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 Package Included 1x Straight Collet Chuck HolderMore Details