【Heavy Duty Material】: Swing-top double brackets are 10 inches high with slotted holes for height adjustment.
【Bolt-On Mounting Hardware】: The included u-bolts mount to crossmembers that are 3 inches wide and 3 inches high. u-bolts are 1/2 inch in diameter, 3-1/16 inches wide, and 4 5/16 inches long.
【Easy Installation】Attach the u-bolts to the trailer, mount the boat trailer bunk brackets to the u-bolts and tighten the screws. Adjust the mounting angle as needed.
【Swivel Design for Convenience】: The adjustable top bracket on the double tier bracket allows you to adjust the angle, which works well for both angled and flat hulls. The double holes make the fixing more secure.