stainless steel fastener:Anti-corrosion,long work life circle,Durable,stable quality,nice surface. stainless steel fastener: Material:W1: All carbon steel W2: Housing and band: Stainless steel; Screw: Carbon steel W4: All stainless steelstainless steel 201 202 301 304 316.Bandwidth:12.7mm ,14.2mm are available. American type hose clamp