Universal Thmostat Guards mount horizontally or vertically.design 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.