Model: ER11 A Type; Material: Cast Iron Hole Diameter: 8mm/ 0.31""; Overall Size(Approx.): 19 x14mm/ 0.75"" x 0.55"" (DH) This is a great replacement collet nut for the broken part; fit most tool holders Package Content: 1 x Clamping Nut Note: Different displays shooting and light may cause the color of the item in the picture a little different from the real thing. The allowable measurement is +/- 1-3cm error. Description: Precision and hardened mass. This collet nut is a great replacement for the broken part. Fit most tool holders. Specification: Product name: Clamping nut Model: ER11-A Standard: Metric Size:19 x 14 mm/ 0.75"" x 0.55"" (DH) Thread size: M14 Thread pitch: 0.75mm / 0.03"" Hex Width: 17mm / 0.67"" Hole diameter: 8mm/ 0.31"" Material: Cast Iron Steel Package content: 1 x clamping nut