This listing is for 4 pieces of 6"x6" steel base plates 6" x 6" surfaceWeight: 2.3lbs (37oz) Thickness: ¼” (6.35mm)Hole size: ⅜” (9.53mm)Distance from center hole to center hole vertically and horizontally: 5"3 gauge thicknessMade of high quality rolled steel These are weldable and printable Shipping is charged only once per orderClick here if you need different sizes!