COLLET ER20, 7/16″ HOLE

ER20, Hole Size 7/16″.
Tool holding range 00.438″ to 0.398″.
Made of high alloy spring steel.
Hardened surface to 44-48 HRc.
Maximum gripping force with 16 jaws.
Runout precision of 0.0006″ (Concentricity of .0003″).