This professional brake caliper compression tool is designed to work with single, twin, and quad piston disc brake calipers (not compatible with drum brakes). Compared to old-style C-clamp tools, it offers smoother operation with less effort, a 360-degree rotating ratchet for flexibility, a wider contact surface for better stability, and both expansion and retraction functionality. For added convenience, the kit includes caliper hanger hooks to support the caliper during service, helping prevent hose damage. It also comes with high-temp brake lubricant to reduce squealing, fight rust, and ensure smooth operation. A wire brush is included for cleaning brake components, along with a pair of mechanic gloves to keep your hands protected during the job. We stand behind our product—if you have any issues or questions, reach out by email and we'll make it right.