The ARRMA Kraton 8S Carbon Steel Pin by GPM MAKX181/PD is specified in 4140 carbon steel to deliver dependable performance in driveshaft assemblies. Intended for both OEM and GPM-produced driveshaft components, these pins maintain secure engagement between the universal joint head and dogbone to reduce slop and protect drivetrain timing under load. The focus is on material strength and fit to improve service life where drivetrain forces are greatest.