- Polycarbonate backplate recommended for use on unstable or uneven surfaces and weather applications. Can be used with STI-1210D, STI-1210E, STI-1221D, STI-1221E, STI-7500D, STI-7500E, STI-7501D, STI-7501E, STI-7510D, STI-7510E, STI-7511D, STI-7511E).
- Product dimensions: 9.25 H x 7.25 W x .25" D.