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The Park Tool Four Sided Spoke Wrench features a unique four-sided design that securely grips aluminum spoke nipples without leading to deformation, allowing you to adjust spoke tension with ease. It's available in two sizes, with the black wrench sized for 0. 127-inch (3. 23 millimeter) nipples and the red wrench sized for 0. 136-inch (3. 4 millimeter) nipples.