flat head insert nut 1.High quality 2.high precision, 3.excellent reliability. material option:1.Bearing Material:carbon, ... 60,62,69,68,6000series, and non-standard bearing series,toys bearingRoller:all kinds of rollers Product Features:1. Good grinding ... EXW,FOBApplication: metal wheels, sports equipment, furniture,machinery and equipment, toys, model aircraft and so on. Welcome to visit our factory