Wheels Manufacturing Derailleurpad Reparatie Set <7Mm Brede PadsDropout savers are designed to replace damaged threads in rear derailleur mounts. Made from aircraft quality steel, dropout savers provide a economical and reilable alternative to the "major surgery" of replacing a complete dropout. Wide Dropout Saver fits dropouts 7mm or more in thickness. Narrow Dropout Saver fits dropouts 7mm or less in thickness. 2 pieces.