About this item 16-Gauge Stainless Steel and T304 Construction: Crafted from high-grade 16-gauge T304 stainless steel, this 21-inch drop-in bar sink is designed for exceptional durability and resistance to rust and stains. Its commercial-grade brushed satin finish helps prevent scratches and dents, ensuring a long-lasting addition to your busy kitchen Demensions and Package: Exterior size:21''x20''x9'', Interior size: 16.62''x15.3''x8.75'', Minimum Cabinet Size: 24''. standard 3-1/2" drain