Flange: 22 gauge stainless steel with exposed surfaces in architectural satin finish. One-piece seamless construction, 1" wide with 1/4" return. Push flap door is 22 gauge stainless steel. Heavy-duty stainless steel piano hinge. Self-closing flap door is embossed PUSH. Waste container door is 18 gauge stainless steel. Warp resistant, with full-length piano hinge and tumbler lock keyed like other Bradley units.