The Keggle Brewing Weldless Thermometer has a 6-inch probe, making it ideal for use in your mash tun. The 6-inch stem is positioned more towards the middle of the mash, giving the thermometer probe more area to read the temperatures from easier. Easy to installed in a kettle or keg only. Not intended for use with coolers. All metal parts are 100% stainless steel, and the gasket is a high-temp, food-grade material. Installation Requires a 7/8" drill bit to install.