Bradley 9813 Specimen Pass Thru Cabinet. 18 gauge stainless steel cabinet with exposed surfaces in architectural satin finish. Welded construction with burr-free edges. 22 gauge stainless steel flanges. One-piece seamless construction, 1in. wide with 1/4in. return. 20 gauge stainless steel door. Equipped with full-length stainless steel piano hinge and chrome-plated brass pull knob. Doors are self-closing. Interlocking mechanism prevents both doors from being open at the same time. 22 gauge stainless steel spill tray with soldered seams to prevent leakage. Removes for cleaning. Adjusts from 3in. to 5-1/2in. wall thicknesses only.