coil roofing nails material:Q195 Diameter:0.12, Length:0.75-1.75" ... :polish,bright,E.G,H.D.G,Shank:smooth,screw Coil Roofing Nails1,Material: Iron , steel2,Shank: Screw, Ring, Smooth.3,Diameter ... *20, 250*20, 300*30, 300*40, 400*40 supply coil roofing nails