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Rubicon Express Degree Shims are designed to handle the rigors of trail use. Manufactured from the toughest steel material to provide maximum durability, it can be used on front or rear locations to set the pinion angles on your vehicle. Unlike other shims, Rubicon Express Degree Shims will not come loose or fall out. It is available in 2°, 2.5°, 4°, 6° and 8° shims. Proudly built in the USA.