Comparison : Item # 20,977, Bronze 220 Sheet 0.032x12x12"
Item # 20,978, Bronze 510 Sheet 0.032x12x12"
Item # 20,979, Bronze 220 Sheet 0.032x12x24"
Item # 20,980, Bronze 510 Sheet 0.032x12x24"
Item # 20,981, Bronze 220 Sheet 0.032x12x36"