From the product description, check product page for current description, price and availability:

• Package contains 1-count of Brew belt fermentation heating belt
• Fits a 7-8 Gallon Plastic Fermenter or a 6 Gallon Plastic Fermenter
• It will maintain at a constant brewing temperature of 75-80 deg F. up to 8 days
• Additional heat source to maintain minimum fermentation temperatures

This 120 Volt Heater can maintain wine or beer fermenting temperatures in cold room, garage, or basement.
Adjusts to fit 3, 5 and 6 gallon carboys or 5, 6, and 8 gallon buckets.
Not recommended for glass carboys.
Package contains 1-count of Brew belt fermentation heating belt
It will maintain at a constant brewing temperature of 75-80 deg F. up to 8 days

From HBF: Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.