Snap-on's John Bean AC400 Touchless Alignment Wheel Clamp from John Bean provides secure clamping without touching the rim. Employs clutch limited-clamping force ensuring secure attachment. Has a self-centering design allowing measurement of cross-diagonal and tire-rolling radius that helps to reveal collision damage and mismatched tire sizes. Made of durable, drop-tested, lightweight cast magnesium construction. Features a large, comfortable handle which is simple to operate and accommodates gloved hands.