This comprehensive kit includes multiple adapters such as 10mm x 1.0, 12mm x 1.25, 18mm x 1.5, and the special 16mm x 1.5 Ford adapter, ensuring compatibility with a wide range of engines. COMPATIBILITY: These adapters are designed to fit our compression tester W80579 and others with a 14mm x 1.25 male thread, providing compatibility with a range of testers.