Wrap-Up Next HD Precision Upper Arm - PurpleWrap Up Next (#0670 FD) HD Precision Upper Arm Purple Feature: For: VX DOCK series and FR D Due to the full renewal, the design of the upper arm has been completely reviewed. The HD Precision upper arm has been developed to improve all elements such as smooth movement without backlash, accurate caster adjustment, and high holding power. In particular, it has been focused on minimizing the swing (backlash) of the upper arm. It prevents alignment