... ,PC Type:umbrella head,with washers,spiral shank Umbrella head roofing nailMaterial:Q195/Q235/Q215(standard ASTM1010)Shank:plain shank or ... connect the concrete, wooden strip and steel sheet. Roofing nail with washerAssembled roofing nail/Roofing screwslength:63mm,75mm,90mm,120mmpacking:100 sets per ...