HEAVY-DUTY ALUMINUM CONSTRUCTION — Built to last with rugged die-cast aluminum, this door hold back resists corrosion and daily wear. A durable trailer door holder for enclosed trailer, box truck, and cargo doors that need reliable, long-term hold-open. SPRING-LOADED LATCH ON KEEPER — The spring-loaded latch mechanism engages quickly to hold a door open and prevent unwanted closing in wind or on uneven ground. Smooth, positive catch helps reduce door slam damage and improves loading safety. COMPACT 4 INCH HOOK & KEEPER — Space-saving 4.00 in arm length delivers strong holding power without bulk.Keeps the door secure when open; ideal replacement for worn door holder or door catch on utility vehicles. ZINC PLATED HARDWARE, KEEPER INCLUDED — Corrosion-resistant zinc plated finish stands up to weather. Kit includes the keeper so you can install the complete door hold back quickly on trailers, service bodies, and cargo vans using common tools. VERSATILE, PRO-GRADE FIT — A go-to door holder for contractors and fleets. Use this hook and keeper on enclosed trailer, box truck, step van, or shop doors to keep aisles clear during loading. Lightweight 0.29 lb design simplifies handling and install.