Feature: 1. APPLICABLE MODEL: The coupler kit is suitable for 1/10 for LOSI Baja Rey, for Rock Rey, for Hammer Rey RC, check for better fit! 2. STEEL MATERIAL: Made of premium steel material, the couplers are wear resistant, rust resistant, strong and sturdy, ensures a long life span. 3. IMPROVE RC PERFORMANCE: The couplers are able to effectively improve the stability of your car, allow better control of the remote control vehicle, and make the remote control vehicle drive more safe and stable. 4. STANDARD SIZE: The couplers are manufactured according to the standard size, they can well match with your RC, and achieve more efficient transmission. 5. IDEAL REPLACEMENT: The couplers are ideal replacements for the old and damaged parts for better strength, backup for your RC! Specification: Item Type: Hex Wheel Hub Extension Adapter Product Type: RC accessories Material: Steel Color: Black Total Length of Product: Approx. 37mm / 1.46in Widening: Approx. 15mm / 0.59in Hex diameter: Approx. 12mm / 0.47in Applicable Model: Applicable to 1/10 for LOSI Baja Rey, for Lock Rey, for Hammer Rey RC car.. Package List: 4 x Hex Wheel Hub Extension Adapter Note: 1. Please allow 1 to 3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.