1.Replace the "Y" link, provides more flexible/larger travel for the front part of the SCX24, avoids any rubbing with the driveshaft 2.To convert the three link into a 4 links design 3.Pre-assembled the rod balls and O rings, no need to assemble these tiny parts before you mount to your SCX24. 4.High quality of Alu# 7075 material, more durable and stronger. 5.Compatible with 1/24 RC Crawler Car Axial SCX24 Deadbolt/Betty; Will NOT fit SCX24 C10 W rangler JLU Bronco Gladiator.