Panel fasteners Once fixed in position, push-on fasteners are so secure that they cannot be removed without destruction. push-on fastener in itself is a precision pressing and is designed for applications where a quick, permanent and efficient means of assembly is required to retain plain shafts of steel, non-ferrous and plastic materials. They eliminate costly threading and grooving operations, facilitate rapid assembly, and once fixed in position, are so secure that they cannot be removed without destruction.