●Because of the thick zinc alloy material, it is more durable. ●The design of the product is simple and smooth, suitable for all types of doors. ●Size : 5.8" (147mm) height , hole diameter 0.55" (14mm). ●Can be installed from 1-3/8"(35mm) to 2-1/8" (54mm) thickness doors. ●Multi-layer casting process integrated.