Boat Trailer Upgrade your aluminum I-beam boat trailer with this heavy-duty square tube aluminum cross-member. Measuring 3 inches x 3 inches x 52 inches (7.62 cm x 7.62 cm x 132.08 cm), with a 1/4-inch (0.635 cm) wall thickness, this cross-member is designed to withstand the rigors of towing your boat. The kit includes all the necessary hardware for installation, including stainless steel U-bolts and hex head bolts, ensuring a secure and long-lasting fit. While the length may vary 1/2", this 52-inch (132.08 cm) cross-member is an industry standard size, making it a versatile choice for most aluminum I-beam trailers. With its sturdy construction and corrosion-resistant materials, this cross-member is an essential upgrade for any boat owner seeking a reliable and durable towing solution.