Modelcraft needle bearings cage type modelcraft hk 0509 modelcrafts cage type needle bearing 9mm od 5mm bore is a minimum radial construction height bearing with outer ring and bearing race that is formed without cutting the bearing is pressed into a body track and does not require any additional axial track it should be fitted using a driver the collar of which comes into contact with the end of the bearing marked with the abbreviations modelcraft hk 0509 needle bearing 9mm od 5mm bor