COLLET ER16 SET imperial, 11 pieces

ER16, 11 pieces of hole sizes: 1/16″, 3/32″, 1/8″, 5/32″, 3/16″, 7/32″, 1/4″, 9/32″, 5/16″, 11/32″, 3/8″.
Made of high alloy spring steel.
Hardened surface to 44-48 HRc.
Maximum gripping force with 16 jaws.
Runout precision of 0.0004″ (Concentricity of .0002″).