Wall mounting. Pennsylvania made 1/8in thick aluminum laser cut and formed thread racks, capable of holding 14 spools. This rack can fit any 100m spool. The posts are 1-1/2in spaced evenly on centers and each post is 2in long. The provided mounting holes are spaced at 16in centers for easily mounting to wall studs. Overall dimensions are 22in Wide, 3 inches High and 1.5in Thick. Threads shown in the pictures are not included.