The open thermostat guard allows for installation without having to remove the thermostat from the wall, just punch holes around the existing thermostat to install it in the correct position, you can install this thermostat guard horizontally or vertically to the right thermostat . The home thermostat box fits most thermostats. The outside diameter of this thermostat lock box is 7.87inch x 5.51inch x 1.97inch. Actual usable dimensions are 6.5inchH x 4.72inchW x 1.65inchD. It fits all shapes of thermostats as long as they measure less than or equal to 6.5inchH x 4.72inchW x 1.65inchD. Please check the size before purchasing. Thermostat lock box with 2 keys prevents tampering, damage and unauthorized thermostat setting adjustments. Keep pesky fingers out of your controllers and protect your thermostat from high bills. The transparent temperature control lock box is made of high-quality acrylic, which is the plastic transparent temperature control lock box. No discoloration, yellowing, and keeps the interior clearly visible after long-term use. It helps you control use in restaurants, offices, houses of worship, schools and industrial environments.