important plumbing hardware set for pros or DIY - for itself saving one trip to hardware store ! . 18 diverse sizes in 3 materials - rubber, fiber and klingerit gasket to stop leaks & seal fittings configurations commonly used in faucets, valves, plugs, pipe & appurtenance connections Organized by size & material in sheer storage case with application/use listing An obvious value - 141 washers for the price of half-dozen at hardware store .