ADJUSTABLE SINE PLATE, FINE POLE MAGNETIC CHUCK V-66SA

ER40, Hole Size 1/2″.
Tool holding range 0.500″ to 0.461″.
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″).