This tough steel 27T MOD1 Pinion Gear provides a direct replacement for your kit item.Features:Strong and durable steel for long-lasting performance in extreme RC conditions - Precision manufactured tooth profile for smooth operation - Precision manufactured double set screw holes - For 5mm motor shaftIncludes:1 x 27T MOD1 Pinion Gear 1 x M4 x 4mm Set Screw