Comparison : Item # 6640-4000, 4.00" PA6 HS Blue Plate / Bar Stock
Item # C6640-4000-48-24, Nylon 6 HS Blue
Item # 6640-400048120, Nylon 6 HS Blue
Item # C6640-4000-48-4, Nylon 6 HS Blue
Item # C6640-4000-48-4.5, Nylon 6 HS Blue