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12 mm piston pin circlip compatibility: compatible with moped, scooter, and small motorcycle engines using 12 mm wrist pins; fits standard C type grooves; check pin diameter and groove before purchase. Spring steel C type circlip design: spring tempered steel construction provides firm axial retention of wrist pins; smooth contact surfaces aid installation and help reduce scoring; suitable for typical workshop conditions. Size and specs for small engines: 12 mm nominal fit for wrist pins; C type profile seats securely in piston grooves; works for two stroke and four stroke commuter scooters and mopeds using 12 mm pins. Installation and safety: use proper circlip pliers and eye protection; orient clip ends away from pin relief; ensure both clips are fully seated in grooves before engine start; reuse is not advised. Applications and kit value: supports top end rebuilds, routine maintenance, and spare parts stocking; handy for home garages, field repairs, and small engine shops; 10 piece set simplifies replacements.