Featuring 2-piece design, Extra-Duty Panel Fastener can be used to connect back-to-back corrugated units, add wire legs to corrugated displays, or attach corrugated shelving to displays. Unit is also suitable for mounting graphics to wire grids or connecting thick boards. Constructed of natural polypropylene with 1 in. or 1.25 in. head, fastener fits 7/16–¾ in. diameter holes and has thickness capacity of .375–1 in.