Inflatable air shim safely lifts and aligns objects up to 300 lbs. with single person operation Lift range 3/32" to 2" for greater versatility Shims doors, windows, cabinets, appliances and other installations - replaces pry bars and wood shims Precision relief valve allows for accurate height adjustment Durable long-lasting polyurethane rubber material won't leave marks on cabinets, furniture or walls