As for the screws,we have many various materials,including aluminum screws, titanium screws, stainless steel screws, steel screws, brass screws,nylon screws are so forth. Different types could be produced as well, such as socket cap bolts, button head bolts,phillips pan head bolts,slotted flat head screws etc.Besides those screws, we also have vibration damper screws, ,which could reduce vibration and knock sound of the worn parts. Custom-made products are available. If you don`t see the nuts you required in our catalog, please send us an RFQ with your specificationns. We could produce or customize them to fulfill your unique needs.