This Longacre Bump Steer Gauge has a simplified design that uses a single precision dial indicator to tell you directly the exact amount of bump steer to within 0.001". No need to subtract one dial reading from another - no chance for error. Most accurate, easiest and quickest way to measure your critical bump steer Extended height design - check bump steer at ride height or on stands Single dial indicator design is much easier to use. You read the bump directly Includes wheel plate with mounting holes for most 4 and 5 bolt patterns (4.5" - 5") and can be modified for other wheel patterns if needed, adjustable stand and precision dial indicator.Available with analogue or digital dial gauge indicator.