2"  ( 50mm ) Diameter Clock Insert Fit-up Unit
with brass color plastic bezel. 
Plastic clear lens.
Quartz unit, very nice quality, attractive and affordable.
Holds into a 1-7/8"  dia. 
hole 
with the rubber friction ring.
Dial/Hands/Clock all in one unit.
Simply insert into hole.
Premium design back time set knob and easy access battery cover.
Includes battery.Standard button-cell replacement batteries
available at Walmart, Hardware and other stores.
Overall Diameter: 2 inches.
Mounting Diameter: 1-7/8 inches. 
Mounting Depth: 1/2 inches.