Sealing Socket Head Screw - Aluminium M3X0.5 mm thread 6 mm length 5.5 mm Head Diameter, 3 mm Head Height 100 pcs. Ultra-Low-Profile Socket Head Screw - Aluminium M3X0.5 mm thread 8 mm length 5.5 mm Head Diameter, 1 mm Head Height 100 pcs. Hex Nut - Aluminium M3X0.5 mm thread 5.5 mm Diameter 100 pcs. Cap Nut - Aluminium M3X0.5 mm thread 5.5 mm Diameter 100 pcs.