This sink is designed to be installed either undermount or drop in. It has a glazed over hanging lip all around the top which allows you to install it also as a drop in. Heat resistant up to 350' F. This sink has been tested and will not crack due to heat exposure from a pots/pans up to 350' F hot. This sink is constructed of solid high-grade fireclay material using high pressure casting, ensuring durability, longevity, and resilience to acids, alkali's, scratches, and chipping. The glazing of the sink surface provides both strength and shine over long periods of time. The raw material used (fine fireclay) allows for uniformity in the finish. Capable of being installed via Under-Mount (countertop over edge of sink), Top-Mount (countertop lower than top edge of sink) Standard 3 ½" center drain and can be used with a garbage disposal. These sinks are not adversely affected by scratches from pots, pans, knifes, etc. Due to the organic nature of the fireclay, material dimensions may vary by 1/8" of an inch. We recommend having the sink on location to trace and measure for countertop and cabinet cut outs. Furthermore , minor imperfections may appear. These are not defects; this is what makes each sink uniquely its own. Defective sinks will not pass our quality control inspection. If planning to install as undermount then this sink requires support from beneath. Purchase the undermount installation kit (Model # ABUMSB) and attach it to the inner side walls of your cabinet. We then recommend putting plywood on the rods, to create a large flat and smooth surface for your sink. Drill the necessary center hole to accommodate for the drain. If you choose not to purchase the kit, you will need to create a custom support using 2x4's.