Original Name / part No.: AR310447+AR310449Part location: Wheel hubs & external side of wheelProduct major functions & usage:1. Linking the CVD towards tires to be able to move the energy and lead a smooth drive.2. Lock and support the wheel tightly.This product includes :Wheel Hex 2pcsWheel Lock 2pcsM4x2.5x15 Screw Pin 2pcsMajor features of upgrading with this part/product:1. Initial depth is 4.5mm, this component is upgraded to 10.5mm for wider wheel track in order to run effectively and many other things stable.2. The hex are created to claw regarding wheels tightly and firmly.3. Original capped design to prevent sand and dirt through the drive.4. Special knurling procedure inside interior part for tight locking.