ER20 COLLET SET imperial, 14 pieces

ER20, 14 pieces of hole sizes: 3/32″, 1/8″, 5/32″, 3/16″, 7/32″, 1/4″, 9/32″, 5/16′, 11/32″, 3/8″, 13/32″, 7/16″, 15/32″, 1/2″.
Made of high alloy spring steel.
Hardened surface to 44-48 HRc.
Maximum gripping force with 16 jaws.
for hole size under 13/32″ Runout precision of 0.0004″ (Concentricity of 0.0002″).
for hole size above 13/32″ Runout precision of 0.0006″ (Concentricity of 0.0003″).