Magnetic Mounting Brackets - Model 02.6220 - For use with Two-Piece Arrow Boards: 02.6200, 02.6216, 02.6216WP, 02.6234, 02.6234WP, 02.6252 and 02.6252WP. For temporary mounting on flat steel surfaces. Sold as a set of two brackets. Heavy-gauge epoxy-coated aluminum. Four 3-inch, 90-pound pull magnets per bracket. Not advised for vehicle speeds over 45 mph. Hardware included.