Drop-In Unistrut Sliders feature two serrated grooves that lock themselves on Unistrut. Their design allows them to drop in from the top of your Unistrut table. Without the need to remove jigging parts to place them, it makes it an easy way to add or remove jigging on and off your table. These zinc plated nuts have a ½”-13 threaded hole and are ½” thick, ¾” wide, and 1-⅜” long.