The basic element of all thermostat controls, all the desirable features of the ideal thermostat – high sensitivity, wide adjustment range, small sized, rugged construction, vibration resistant, and low cost are included in this thermostat control. This unit may be inserted in a 15.875mm (58") reamed hole.If reamed hole is used; a short spline should be added this prevents thermostat from turning when the temperature adjusting sleeve.