4PCS Wheel Extension Hex Spacer Drive Hub Aluminum Adapter Widener 12mm Turn 17mm for 1/10 Off-Road RC Car

4PCS Wheel Extension Hex Spacer Drive Hub Aluminum Adapter Widener 12mm Turn 17mm for 1/10 Off-Road RC Car Feature: - Made of high-quality durable aluminum alloy material, Sturdy and durable for long time use - It can change the hexagonal joint from 12mm hex to 17mm hex conversion. Suitable for screwing on a 4mm axle  - A better replacement tool to modify your remote control car and improve its overall performance - Lightweight and easy to install and remove. Increased strength and precision - Total length: 38mm - Offset:30mm. - Max axle diameter: 5mm - Axle thread: M4 - Color:Blue - Weight: 75g Package includes: 4x Wheel hex hub 4x Screw cap 4x Bolt Note: Not suitable for 2WD rc car using the bearings instead of 12mm hex hubs