A drop-in sink is a kitchen or bathroom sink that can easily be lowered into the designated space in the counter-top. The rim of the sink extends so that it rests on the counter and carries the weight of the sink. Clamps that are located underneath the sink the help to make it more secure. Drop-in sinks are available in several materials, including stainless steel, porcelain and granite. The sinks may have holes to accommodate faucets, or the faucets may mount directly on the counter-top. A drop-in sink is often the choice for do-it-yourself homeowners who want to update their kitchens or bathrooms. The sink can be installed quickly and easily, and there are several styles and sizes available.