Stainless steel exterior front, back, bottom. The very finest stainless with higher tensile strength for fewer dents and scratches. Aluminum interior side walls & back with stainless steel floor and ceiling. One (1) heavy gauge stainless steel ramp standard. Designed to accept roll-in racks (inboard castors) with maximum dimensions of 27""L x 29""D x 72""H (686 mm x 737 mm x 1829 mm)(supplied by others). One (1) heavy gauge stainless steel ramp standard. Three (3) lifetime guaranteed, cam-lift hinges. Full 180° open capability with a stay open feature at 120°. Lifetime guaranteed heavy duty all metal working door handle. Entire cabinet structure and solid door are foamed-in-place using Ecomate. A high density, polyurethane insulation that has zero ozone depletion potential (ODP) and zero global warming potential (GWP).