NEMA 4 1-Door Freestanding Removable Pin Hinge Disconnect 72X27.5X18 Carbon Steel - Gray. Designed to protect electrical components and instruments in typical industrial environments. Removable hinge pins reduce time and effort while removing enclosure doors, allowing access to internal components. Body and door are fabricated from carbon steel. Heavy-Duty 316 Stainless Steel Removable Hinge.