flat head insert nut 1.High quality 2.high precision, 3.excellent reliability. material option:1.Bearing Material:carbon,chrome,stainless steel,iron ... Material:POM,nylon,glass fiber,etc3.OEM and non-standard bearing&roller orders are available .4.Craft: heat treatment, fine ... etc.Series:60,62,69,68,6000series, and non-standard bearing series,toys bearingRoller:all kinds of rollers Product Features:1 ...