Made In The USA! 
General
General
This patented (Info), versatile clamping systems can be used on either a grooved or flat 2” wide aluminum post of a screen enclosure or fence. The Groove Grip design is used to grip onto the inside edges of the grooves of the post. The Outside Grip design grips the outside edges of the aluminum extrusion that do not have grooves in them. See Images below for examples.
Anchor Utility Hook on 2″ wide screen enclosure post with grooves (Groove Grip)
Octopus Towel Hook on 2″ wide screen enclosure post with flat surface (Outside Grip)
The Outside Grip products can be used on 2″ square fence posts as well!