GM Caliper Compatibility: Designed to work with GM single piston brake calipers used on many GM vehicles from 1967 through 1988 for dependable brake service and repair. Integrated Sleeve Design: Built-in sleeve eliminates the need for a separate bolt sleeve, reducing extra components and simplifying brake maintenance. Correct Thread Specification: Features 7/16"-20 threads to fit common GM D52 and D154 caliper brackets for secure and proper caliper mounting. Original Style Socket Head: 3/8" hex Allen socket head design matches original GM hardware size for easy installation and removal with standard tools. Complete Hardware Set: Includes four caliper slide bolts measuring 4-3/8" overall length with 3-3/8" underhead length for servicing both sides of the vehicle. Kit Includes: (4) Speedway GM Brake Caliper Slider Slide Bolt. Speedway GM Brake Caliper Slider Slide Bolt The overall length of these slide bolts is 4-3/8" The underhead length is 3-3/8" The thread on the bolts is 7/16-20.