Works Connection Elite Axle Blocks Blue 17-280 Ultra-slim, precision CNC-machined from 6061-T6 billet aluminum Tighter tolerances than OEM parts to help ensure accurate alignment of the rear wheel, prolonging chain and sprocket life Reversible design keeps your adjustment bolts from extending beyond their service range Anodized finish Sold in pairs Laser engraved WC logo Made in the U.S.A.