It is mounted on a small 1-5/8" x 2-5/8" flat polished metal plate. The switch cutout area is 1-1/8"H x 7/16"W behind the plate. The depth of the cutout is 5/8" and there are two terminal blades that extend back another 3/8". Those blades can be used for crimped or soldered connections.
It is rated to 15 amps at 125VAC and 10 amps at 14VDC.