This is a set of 2 spring loaded mounting clips for surface mounting our slotted extrusions to drywall, wood, granite, brick, or any other solid surface. Works with a variety of our aluminum extrusions listed below. To use, simply drill a 5/16" - 3/8" wide hole into a surface at least 3/8" thick and push the spring through. Comes with 2 clips, one for each end of the profile. For a more secure mount multiple mounting springs may be necessary.