1 x pack of 25 Galvanised. Enough to assemble a 420h Garden Bed. 
 
How many do you need? For a standard bed, each side or end rail requires 2 screws, 1 at each end. Each rail is 140mm.
 
So if you are building a 420mm high bed (three rails high on each side and each end, totalling 12 rails), you'll need 24 screws.
 
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