Electron Linkage Rod DESCRIPTION Aluminum Ball Link: Electron Retracts quality, now available in Electron Accessories Highlights: PERFECTLY PRECISE; smooth, and slop-free. THOUGHTFUL DESIGN; Carefully milled from aircraft grade T6 7075 aluminum, finished in anodised black and with laser engravings. The ball part is made from self-lubricating brass, resulting in no maintenance or grease required and carbon rod. DIFFERENT TYPES FOR EACH APPLICATION; We offer 4 different sizes of ball links, each of them available in two mounting types. Available in 10 different lengths are available from 60 mm up to 160 mm, for support many applications.e in many applications. WHAT IT'S IN THE BOX: 1x Linkage Rod (Preassambled) 2x Ball links, assembled 2x Nuts for length adjustment, assembled 4x Brass spacers