Screws: 1 Material:Brass,aluminum,stainless steel,steel; 2 Wide variety of size,type; 3 Specific design possible. Screws:1 Material:Brass,aluminum,stainless steel,steel;2 Wide variety of size,type;3 Certificate:ISO9001:2000;4 Great inventory;Short time delivery;Immediate quotation;Low Minimum Order. Screws