FOW74-101-777 Features: -Measures disc brakes and up to 12'' on brake drums. -When measuring brake drums only, add 8'' to measurement allows for long cone and jaw widths. -For use with 6'' and 8'' calipers. -Drum and Rotor Measuring Kit with Caliper. Product Type: -Calipers. Dimensions: Overall Length - Side to Side: -5.5 Inches. Overall Height - Top to Bottom: -3 Inches. Overall Depth - Front to Back: -11.7 Inches. Overall Product Weight: -1.35 Pounds.