There is a threaded section on the back of the thermometer (44mm long that takes a 32mm wing nut (included It is stainless steel and very, as you just insert the through the hole on your pit / smoker / grill and then attach the nut, which is included Accurately measures temperature inside barbecue grill This thermometer ranges from 100 degrees to 800 degrees in cooking temperature Thermometer Face Diameter: 60mm Total length: 80mm, Manufacturer: Beimus