The FCAVCA Variable Column Adapter makes it possible to add displays to I-beams, box-beams, trusses and a variety of column shapes and sizes. For use with Fusion, Fusion Modular and Thinstall Swing-Arm mounts. Compatible with MTMS1U, MTMP1U, MTM1U, LTM1U, FMSWM, TS118SU, TS218SU and TS318SU mounts.