The ServoCity Shouldered 8mm REX™ Hub-Shaft (20mm Hub Offset) serves as an integrated shaft and hub solution for rotating assemblies. It is designed to fit seamlessly into goBILDA® 1120 Series U-Channel, enabling the drive of various components such as wheels, arms, gears, and sprockets. The shoulders are engineered to work with round bearings and steel Miter Gears, simplifying the construction of 90° drive assemblies. The 8mm REX™ shaft ensures a robust and reliable drive mechanism.