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mount horizontally or to protect virtually any thermostat.each cover comes with 2 keys.replacement keys are avaliable through your local branch. HIGH-IMPACT PLASTIC probe-resistant modles have double-wall desgin to prevevt tampering. METAL Nos.77-FG3 and 77-FG6 have solid and ring base,and can be mounted directly on the eaposed J-box.No77-FG9 has ring base only. 304 STAINLESS STEEL long life and durable performance in humid and corrosive environments.