Installation Tool Size: 10 x 1., 7cm / 3., 9 x 0., 7 (L*Max., D) , Disassemble Tool Size: 10., 7 x 1., 7cm / 4., 2 x 0., 7 (L*Max., D) This professional quality valve spring compressor tool set can be use on cars, small marine engines and most motorcycle engines. The range of adaptors sized makes this set one of the most versatile on the market as it will remove and compress springs on most cylinder heads This professional quality valve spring compressor tool set can be use on cars, small marine engines and most motorcycle engines. ACZCR Valve Pressure Spring Installer/Remover for BMW N13, N20, N26 Motorcycle Valve Tool Universal Overhead Valve Spring Compressor Remover Installer Tool For Ohv Ohc Chv Engines I.790174415 Compressor Tool For Cylinder Heads Installation Tool Inner Dia., : 12mm / 0., 47; Disassemble Tool Inner Dia., : 6mm / 0., 24 Valve Spring Compressor Tool – XS650 Direct Package Content: 1 x Motorcycle Valve Tool Set; Shell Color: Dark Gray Package Include: 1 x Motorcycle Valve Tool Set