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Park Tool WAG-5 Portable Dishing Gauge for 24-29" Wheels. For a wheel to perform properly it is important for the rim to be centered between the locknuts of the hub or “dished.” To check this and to make precision adjustments a wheel alignment gauge (also called a “dishing tool”) is a must. The Park Tool WAG is an accurate and truly versatile wheel alignment gauge that belongs alongside every truing stand.