This larger style Thermostat Guard will keep anyone without a key from changing the settings on your Thermostat. This Universal Guard lives up to its name as it fits almost all existing thermostat models. The guard comes with a clear plastic cover, clear plastic ring base, opaque plastic wallplate, Tumbler lock, wall mounting screws and two keys. This unit can be mounted horizontally orvertically on a wall or exposed junction box. Slots in the back-plate allow HVAC system wires to be passed into the box and vents in the side allow air to circulate into the box.Dimensions:Inside - 8 3/8" wide, 5 7/8" high, 3" deepOutside - 9 3/4" wide, 7 1/4" high, 3 3/8" deepFits Thermostat Models:Honeywell ITT General White RodgersT42 T7300/Q7300 T80 1C30 1F58T87/Q539 T7400 T90 1C31 1F60T92 T8034 T91 1C70 1F62T451 T8082/Q682 T199 1D30 1F70T498 T8085/Q682 T330 Series 1D35 1F72T631 T8090/Q682 T340 Series 1D36 1F75T641 T8131 1E30 1F76T651 T8132 Seco 1E31 1F90T694 T8195 TA-2000 1E35 1F91T810 T8600 TM-1000 1E36 1F92T822 T8601 TM-1400 1E56 1F93T834 T8602 1F30 1F94T841 T8603 Enerstat 1F56 1F95T874/Q674 T8611 HC-7 1F57 1F97T921 T8621 K3-WNT4039 T8624 K4-W RobertshawT6051A,B T8631 MS-1N TX400T6052 W884 HP-2 300-610T&047 DSP100-700 300-620T7200 ET52 300-630HP-1 300-642500 SeriesColumbus Electric American StabilisRSH-420 R90 and Digistat ModelsRSV-420 R100HPC Series R105R106HP1HP10HP15/20/22HP100HP150/200/220HP1000HP1500/2000/3000HP2001Simplstat