Product Details This tough steel 19T Mod1 Safe-D 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 manufactured wide tooth profile for smooth operation - 'D' shaped hole ...Product Details This tough steel 19T Mod1 Safe-D 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 manufactured wide tooth profile for smooth operation - 'D' shaped hole to match motor shaft profile so drive and brakes are not lost if the set-screw backs out - Suits 8mm motor shaft diameter - Precision manufactured threaded set-screw hole - E-clip supplied for motor shaft pinion retention Includes 1 x 19T Mod1 Safe-D Pinion Gear (8mm Motor Shaft) 1 x Set Screw - M4 x 4mm 1 x E-Clip - 5.6mm