... company,our products was strickly controlled in quality and surface. 1. Prime cold rolled steel coil2. Certificate:ISO9001:20083. payment ... the steel. Grade:JIS,ASTM,AISI,GB,DINSpecification:0.18mm~1.2mm*800mm~1000mmInner Diamete508mmNet weight4MT~8MTThickness tolerance+ /- 0.02MMWidth ... 2MM / - 2MMstandardJIS,AISI,ASTM,GB,BS,DINApplication:High Grade Security Door, Construction Material, and so on