The hatch half of the fitting measures 1-1/2" X 1-1/2". The deck half measures 1-1/2" X 3/4". It uses a total of 6 fasteners, four on the hatch and two on the boat.

At some point in production (unrecorded by Catalina) this fitting was replaced by a stainless steel hasp. See part #Z1112 shown under "May we also suggest" below for the appropriate hasp.