Body-Solid’s Chicago Extreme Bumper Plates provide extreme performance without breaking the bank.  The Chicago Extreme Bumper Plates are the most durable plates in the Body Solid lineup; featuring superior durability in any facility with a quality smooth finish and classic black color.  Every plate is made to the IWF standard diameter of 450mm (17.72”).  The OBPX plates have a thinner width than the other Body Solid bumper plates allowing you to load more weight on the bar.  Diameter 450mm (17.72”), IWF Standard Collar Opening 50.8mm (2”) Smooth Black Finish 3 Year Commercial Warranty: 25, 35, 45 Pound Plates 1 Year Commercial Warranty: 10, 15 Pound Plates ALL PLATES SOLD INDIVIDUALLY   Bumper Plate Widths 10lb Plate Width : 1 Inch 15lb Plate Width : 1 ¼ Inch 25lb Plate Width : 1 7/8 Inch 35lb Plate Width : 2 3/8 Inch 45lb Plate Width : 2 7/8 Inch