When you have a big event there isn't time to keep going back and straightening your rows of seating. This set of 2 ganging clips attach to the top and bottom of the chairs to maintain row uniformity and help you get finished faster. Heavy duty black plastic for durability Designed for extra wide plastic folding chairs Suitable for .75" diameter frames PRODUCT MEASUREMENTS: Overall Size: 2.875"W x .625"D x 1"H; No Assembly Required