The FCBT690 bollards are Marine grade, corrosion resistant, heavy walled aluminum. Tower body is extruded aluminum with two standard heights of 36″ or 42″. Lens is clear, polycarbonate. Neoprene continuous closed cell gasket to seal out contaminants. Captive and recessed stainless steel, tamper resistant hex socket screws. Mounting insert sets base flush to surface. Base is anchored through with a set of four 12″ length x 3/8″ diameter hot dipped bolts. Standard polyester powder coat finishes include black, bronze, silver and white with custom or RAL colors also available.