These Link Mounts are designed to mount on a flat surface such as a truss. They are CNC cut and bent from 1/4" thick mild steel. The bend strengthens the mount so no additional reinforcement is needed. Available in 1.75", 2.0, and 2.63" inner widths for the most common joints. Hole size 9/16" but you can drill it out to up 1.0" if you'd like. INCLUDES 2 BRACKETS.