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The driver shim (or thrust washer) fits between the driver and the hub body bearing and prevents the driver from grinding into the hub body. The same driver spacer is used for every Profile and Madera hub, (Profile Mini, Totem, Elite, High Flange, MTB, and Elite MTB, and Madera V2 Cassette.)

-STEEL (.81″ OD X .596″ ID X .025″ THICK)