A Master bolt kit is a specialized collection of bolts tailored for 1960-1970 classic cars, including Ford Mustang, Ford Truck, Ford Bronco, GM Chevelle, Camaro, GTO, Chrysler, and more. These kits, organized into engine, body, interior, and chassis categories, consist of individually packaged sets. Each bolt within the master kit is meticulously labeled for specific applications, featuring accurate head markings and finishes to ensure authenticity and precision in restoration or maintenance tasks for these classic vehicles.