• Package includes 11 pieces R8 collets.
• Total 11 colets with hole size: 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", and 3/4".
• Made of prome quality alloy steel hardened to HRC 60.
• T.IR 0.0003".
• Indicated fractional size is imperial size NOT Metric conversion.
• DIN6499B standard.