Thermostat support details

 Here Thermostat works on the principle of thermal expansion of solid materials. A traditional thermostat has two pieces of different metals bolted together to form what's called a bimetallic strip (or bi metal strip). The strip works as a bridge in an electrical circuit connected to your heating system.  including  7mm hole for  rawl plug galvanized strap   20 x 2mm  also dimension shown in drawing .