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BIG NUTS FRAME SAVER WASHERS by ATOM BIKES HARDCORE HARDWARE. 3/8" x 7/8" bicycle axle washers made of extruded 6061-T6 USA aluminum. 1/10th inch thick (.100"). A set of four weighs 5.3 grams. Quality hardware made by hand one at a time, backed with the same lifetime guarantee as all ATOM BIKES components. Raw finish. One photo shows the difference in diameter as compared to our standard racing washers. This larger diameter helps prevent "pinching" your dropouts.