Hofmann's Touchless Alignment Wheel Clamp, No. AC400, allows service technicians to get accurate and repeatable results quickly and efficiently, all without the clamps touching the wheel rim. Its self-centering design allows measurement of cross-diagonal and tire-rolling radius to help reveal collision damage and mismatched tire sizes. Clamping can be accomplished in just a few turns with a single fast-action adjustment knob that adjusts to the full range of tire sizes without exchanging accessories. The clutch limited-clamping force ensures consistent and secure attachment. It also features a large, comfortable handle that is simple to operate and accommodates gloved hands.