Wall mounting. Pennsylvania made 3/16in thick aluminum laser cut and formed thread racks, capable of holding 42 Large Isacord spools. However is rack is able to hold any cones up to 6,000 yds. The posts are 3.00in spaced evenly on centers and each post is 4.36in long. The provided mounting holes are spaced at 16in centers for easily mounting to wall studs, not all mounting holes are needed. Overall dimensions are 23in Wide x 36in High x 4in Thick. Threads shown in picture are not included.