Comparison : Item # 40,570, Steel O1 Flat Bar 0.015625x0.5x18"
Item # 40,571, Steel O1 Flat Bar 0.015625x0.75x18"
Item # 40,572, Steel O1 Flat Bar 0.015625x1.25x18"
Item # 40,573, Steel O1 Flat Bar 0.015625x1.5x18"
Item # 40,574, Steel O1 Flat Bar 0.015625x2x18"