C.E. Smith Stainless Steel U-Bolts - Keep your trailer maintenance free with these stainless steel u-bolts for mounting brackets & accessories to trailer frames. Made from a high quality 304 stainless steel, corrosion will be a thing of the past! Features: Square bend 7/16-14in dia/thread 3-1/8in x 4in Comes packaged with stainless steel nuts and washers.