Heavy-duty door popper kit designed for custom and shaved-door applications. Each popper provides a full 1-1/2 inch stroke with a strong 25-pound pushing force to ensure reliable door release. Measures 3-9/16 inches when retracted and 5-1/16 inches extended. Compact design fits easily inside door cavities while delivering smooth and consistent performance. Built for durability and long service life in street rod and custom vehicle installations.