Description: Compatibility: These 1.9inch carbon fiber wheel hubs are designed for 1/10 scale rc crawler cars, SCX10.Material: The 1.9inch wheel hubs are made from carbon fiberwheels face and aluminum alloy rear rings and hub, ensuring long term use and resistance to wear and tear.Design: Featuring a CNC machined clamp rings, these wheel hubs offer high clearance inner wheel opening for better performance on rough terrains.Easy to Install RC wheel hub is easy and convenient to install and remove.Size & Package: Each wheel hub measures 59mm in outer diameter, 47mm in inner diameter, with a width of 27mm, 12mm hex , coupler thickness of 15mm, and center hole of 7mm, includes four pieces of these carbon fiber wheel hubs. Size Chart: Out Diameter:5.9cm/2.32inchInner Diameter:4.7cm/1.85inchWidth:2.7cm/1.06inchHex: 1.2cm/0.47inchCoupler Thickness:1.5cm/0.59inchCenter Hole: 0.7cm/0.28inch Package Includes: 4 x 1.9inch Wheels Rims Note: Please allow slightly errors due to manual measurement and different monitors.