This tough steel 15 Tooth 0.8 Module CNC Pinion Gear is the perfect part to carry in your RC tool box.Features: Strong and durable steel for long-lasting performance in extreme RC conditions Precision CNC machined Wide tooth profile for smooth operation Suits 1/8" (3.175mm) motor shaft diameter Laser etched with tooth count for easy identification Precision manufactured threaded set-screw hole M4 x 4mm set screw included Includes:1 x 15T 0.8 Mod CNC Pinion Gear 1 x Set Screw - M4 x 4mm