Adjustment key for supports

The adjustment key allows setting of the height of the adjustable wood joist supports but can also be used to unlock and raise the patio once the pieces are assembled. It is compatible with supports with the following heights: 0.3 in to 0.8 in (8 mm to 20 mm), 1 in to 1.6 in (25 mm to 40 mm), 1.6 in to 2.4 in (40 mm to 60 mm), 2.4 in to 3.5 in (60 mm to 90 mm).