ITEM NAME:1/10 RC Monster Truck 3.175mm Motor Gear 16T 17T 18T 21T 22T Pinion 32DP 5Pc Description: 16T-20T Pinion Gears Engine Combination Made of high quality material, includes adjusting bolt Durable metal construction for long-lasting performance Anti-rust treatment on the surface of gears Suitable for 3.175mm of engine shaft 1/8 1/10 RC buggy monster truck brushless brushed motor Size Chart: 16 T Diameter: 14.3mm/0.56inch 17 T Diameter: 15.1mm/0.59inch 18 T Diameter: 15.9mm/0.63inch 19 T Diameter: 16.7mm/0.66inch 20 T Diameter: 17.5mm/0.69inch Package Includes: 5 Pieces Motor Gear(16T 17T 18T 19T 20T).5 Pieces Motor Gear(16T 17T 18T 19T 20T). 16T-20T Pinion Gears Engine Combination. Suitable for 3.175mm of engine shaft 1/8 1/10 RC buggy monster truck brushless brushed motor. Made of high quality material, includes adjusting bolt.