4 Bolt Flange Mount 1/2" Bolt Holes 3/16" Thick Steel 3 1/2" x 3 1/2" Sq. $ 5.00 Qty: Add to Cart Tube Flange Mount: Material Type: Mild Steel Material Thickness: 3/16" Bolt Hole Diameter: 1/2" Length: 3 1/2" Width: 3 1/2"