This flat bottom heavy duty clamp comes with a 3/8"" u-bolt and zinc plated flange nuts. The saddle design gives a positive seal without cutting the pipe, while the heavier gauge steel and narrow legs provide additional rigidity and durability. This same design is offered with the addition of welded tabs on the legs for maximum support. All Nickson tubing products are made from 16 & 18 gauge aluminized steel that will last longer under the car.