SpecificationsRoofing Bolts with nut ruuber washer Place of Origin: Shandong,Website:://.xinyuannails.com,China Length: 250mm Screw Diam:1/4" Rod Diam:5.2mmBuilder Bolts with washerSpecifications:1.Name: Roofing Bolts with Square Nuts2.Material:Iron3.Surface Treatment: Electric Galvanized4.Length:250mm5.Screw Diam:1/4"6.Rod Diam: 5.2mm7.Packing: 1)100pcs/box with plastic inside,5box/carton,2) according to ur requirement etc.