1)roofing bolts with nut 2)Size: M6~M20,1/4"~3/4"... 3)Length: 12~200 mm;1/2"~12" 4)Surface treatment: plain, black, zp,HDG. roofing bolts with nutMaterial:carbon steel, stainless steellength:12-200mm,1/2"-12"thread size:M6-M20,1/4"-3/4"Surface: zinc plated, nickle plated, chorme plated, polishing, magni, paintingPacking:bulk packingDelivery :25 days zinc plated roofing bolt screw with nut