The Panellift Model 439 Panellift Brand Drywall Lift is our top-of-the-line commercial duty model, catering to professional contractors and the tool rental industry. It is built with a patented multi-stage chain lift mechanism that ensures the lift's safety, longevity, and versatility. No other drywall lift can match the quality and performance of the Model 439. Genuine Panellift brand Chain Driven, no cables Easy assembly ? no tools required Sheets up to 4?x16? 3-year limited warranty Max load rating 200 lbs.