Durable construction: carbon steel Q235B material, 4 mm (0.16 in) thickness,0.58 kg (1.3 lb) per unit Corrosion protection, oxidation resistance: electro-galvanized finish The well of the strut to the plate, overlapping weld with no gaps 9 Mounting holes: 13.5 mm (0.53 in), fits for 1/2 in bolt(NOT included), 3 adjustable holes Side orientation: convenient to install Strut Channel 8 Mounting Holes for 1-5/8” Strut, Heavy Duty Rectangle Fence Post Base Channel, Carbon Steel Electro-Galvanized Coating, 5.5 mm (0.22 in) Thickness, 2.5 x 6 in Base, 1.96 lb/unit (4 Pack) Specification: Material: carbon steel Q235B Finish: electro-galvanized Thickness: 5.5 mm (0.22 in) Height from base bottom to top: 88 mm (3.46 in) Base: 64 x 150 mm (2.5 x 6 in) Screw hole: 13.5 mm (0.53 in) Suitable for 1-⅝ inch Strut Weight/unit: 0.89 kg (1.96 lb) Packing list: 4 x Rectangle post base channel with 6 mounting holes and 2 adjustable holes