Arrma Safe-D5 Steel Mod 0.8 Pinion Gears feature a D shaped hole that locks onto the motor shaft and helps to prevent the loss of drive and brakes if the set screw backs out. These gears are machined from steel for durability and fit 5mm motor shafts.  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 5mm motor shaft diameter  Precision manufactured threaded set-screw hole  E-clip supplied for motor shaft pinion retention Includes: 0.8 Module Safe-D Pinion Gear (1) Set Screw - M4 x 4mm (1) E-Clip - 3.2mm This product was added to our catalog on March 23, 2021

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PTK-8068, ProTek RC Steel Mod 1 Pinion Gear (5mm Bore) (15T) ProTek R/C Steel Mod 1 Pinion Gears are an affordable pinion gear option that doesn't skimp on quality. CNC machined from hardened steel material, these precision cut gears are durable and are perfect for any Mod 1 pitch application. Available in 11 - 20 tooth variants, these gears feature a 5mm bore with the tooth count engraved on the gear for easy identification. Plus, each gear includes a setscrew to make installation easy. Choose the tooth count you need from the pull down menu above. This product was added to our catalog on February 8, 2022

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