Caterpillar (CAT)-style premium aftermarket motor-grader blade. Part reference 7D1577-C. Application/reference: Grader Blade. Motor-grader cutting blade for road maintenance, leveling and finish grading. Carbon-steel version in the PETRAX range. Mounting: 5/8-in plow bolt; confirm length and hole pattern before installation. Brand reference: Caterpillar. PETRAX premium aftermarket replacement; OEM names and part numbers are used for identification only. This item fits only the specified system and matching mounting dimensions.