Good surface quality and bright high grinding ,accuracy Material:JIS STANDARD:SPCC,SPCD,SPCE.Surface Condition: Frostedface, Softness and Bright.Tempering: Bright Annealed or Full HardInner diameter : 505mm-508mmThe thickness tolerance:± 0.02mm, The width tolerance: ±0.2mmWrapper of the package: Anti-rust paper on the surface of the , Then PVC wrapping paper outside the anti-rust paper, then we ...