Gripper fins hold signs firmly in vertical (flag) position. Use two holders to support larger signs. Hinged style option is great for mounting signs in high traffic areas - flexible hinge swings and returns to original position when bumped. The 1" on center base prongs are designed to securely fit into most standard pegboard holes. Removable and reusable. Assembled telescoping arm easily adjusts from 13" to 21" long in 1" increments. No assembly required. Patented & Patent Pending.