1). HOT DIPPED GALVANIZED STEEL (GI) Quality : Commercial Quality (Soft & Hard), Lock Forming Quality, Drawing Quality, Structural Quality as per JIS G 3302, Cold Rolled Base : SGCC, SGCH, SGCD1/2/3/3N, SGC 340/400/440/490/570 Hot Rolled Base : SGHC, SGH 400/440/490/540 as per ASTM A653-97 and EN 10142 / EN 10147 Zinc Coating Thickness : Z 08/12/18/22/25/300 (80 - 300g/sqm on both surface) Surface Finish : Regular Spangle, Minimized Spangle, Zero Spangle, Galvannealed Surface Treatment : Chromated, Non-treated (Dry), Organic Oiling : Unoiled or oiled Available Thickness : 0.18-3.00mm Available Width :20mm-450mm 2.)cold rolled steel Quality specification : Commercial Quality (CQ), Drawing Quality (DQ), Deep Drawing Quality (DDQ), Stablized Deep Drawing Quality (DDQ-N), Structural Quality (STQ) JIS G 3141 : SPCC, SPCD, SPCE, SPCEN ASTM : A366, A619, A620, A611 BS 1449 : CR4, CR3, CR2, CR1, CR34/20, CR37/23 DIN 1623 : St 12, St 13, St 14, St 37-2, ST 70-2 Surface Finish : Dull Finish, Bright Finish Edge : Mill Edge, Slit Edge (Trimmed Edge) Oiling : oiled (heavy, general, or light, dos oiling, powdering) or un-oiled. Temper grade : As annealed, Standard, 1/8 hard, 4/1 hard, 1/2 hard, 1 full-hard Size availability Thickness : 0.18  2.3mm Width :20mm-450mmmm Packing : Horizontal packing, Vertical packing (eye to sky) 3.)drywall stud and channel specificaions and based your require.