Modelcraft needle bearings cage type modelcraft hk 0408 modelcrafts cage type needle bearing 8mm od 4mm 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 0408 needle bearing 8mm od 4mm bor