flat head insert nut 1.High quality 2.high precision, 3 ... Material:POM,nylon,glass fiber,etc3.OEM and non-standard bearing&roller orders are available .4.Craft ... etc.Series:60,62,69,68,6000series, and non-standard bearing series,toys bearingRoller:all kinds of rollers ... bearings for carbon steel, bearing steel , stainless steel,non-standard bearing and injection molding roller and dysmorphism parts ...