Billet Aluminum Stagger Gauge with RollerThe Longacre Advantage Roller on One End For faster, easier measurements Tight Tolerance Tube Tight tolerance inner & outer tube for more accurate readings with no 'slop' Extra Long Billet Arms Longer 9 3 4"" arms for wider tires Thick 3 8" T6 Billet for extra rigidity (some other brands are 1 4" or less) Bolted Together No welding distortion Anodized red Scales on 2 Sides Easy to read with the tires on the car or on the ground Reads to 1 8"