1.Needles retainers K series 2.Bore Size:5- 55mm. 3.Outside Diameter: 9 - 63 ... appliances ,Textile machine,Printing machine, Fitness sports equipment,Medical device,Printer,Automatictellermachine,Modelairplane etc.Precision rating: ABEC1,ABEC3,ABEC5,ABEC7,ABEC9 ... materials according to customers' requirment. Precision Needles and retainers K series