Features: All new R056 gear could for most toy RC trucks, use as the replacement part of your toy accessories. Suitable for DIY hand toys, specially for toy RC truck, replacement of your electrical toys a for fresh new service cycle. Carrying with 9 options gear teeth under solid constructions, benefits for low noises with higher torque, serve you a brand new DIY handmade toy experience. Made by durable stainless steel, which has lasting performance for RC truck parts. Made of plastic and metal, applicable for most RC trucks. Specifications: Material: Stainless Steel Model Name: R056 Model Options: R056-8/R056-10/R056-12/R056-12-28/R056-12G/R056-12TG/R056-26/R056-3/R056-4 Size: Approx. R056-8 : Tip Diameter: 4.7 mm/0.18 inch Internal Diameter : 2 mm/ 0.07 inch R056-10: Tip Diameter: 4.6 mm/0.17 inch Internal Diameter : 2 mm/0.07 inch R056-12: Tip Diameter: 5.2 mm/0.20 inch Internal Diameter: 2 mm/0.07 inch R056-12-28: Tip Diameter: 14.7 mm/0.57 inch Internal Diameter: 3 mm/0.11 inch R056-12G: Tip Diameter: 6.7 mm/0.26 inch Internal Diameter: 2 mm/0.07 inch R056-12TG: Tip Diameter: 5.5 mm/0.21 inch Internal Diameter: 2 mm/0.07 inch R056-26: Tip Diameter: 13.7 mm/0.53 inch Internal Diameter: 3 mm/0.11 inch R056-3: Tip Diameter: 11.1 mm/0.43 inch Internal Diameter: 3 mm/0.11 inch R056-4: Tip Diameter: 10.8 mm/0.42 inch Internal Diameter: 4 mm/0.15 inch Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1Piece RC Truck Gear