The 3 Compartment niche is convenient for holds multi size items. This niche fits in the space of one 12×12 or four 6×6 ceramic tiles with no cuts necessary. Pair this unit up with the 1 Compartment and have plenty of storage for your shower toiletries in your shower. Overall size is 12 3/4″ x 12 3/4″ x 4″ Cut out size is 11 3/4″ x 11 3/4″. Ribs of lower shelf have the backs removed so soap doesn’t slide out. Please consider the Large two compartment as it is our “Best Value” as it holds more than the 3 compartment and fits between the studs easier. Install level in cut out opening using silicone caulk and tape in place with aluminum tape overnight, finish caulk next day. Please consult you tile setter, bathroom contractor or person who is remodeling your shower before purchasing. You Tube “ceramic niche install” Simple Ceramic Niche install video.