... : 17-252mm material: W1,W2,W4 W1: all zinc platedW2: bolt, axis,and coupling with zinc plated . others are stainless steelW4: all stainless ... duty clamp, quick clamp, single ear clamp, handle hose clamp,double wire clamp, clamp with rubber and so on.1.robust hose ... clamps, you can contact us any time. w1 carbon steel galvanized robust clamp with solid nut