RWO's U-Bolt (Bow eye) is made from grade 304 stainless steel and comes with a top plate, nuts, and washers. The collars on the shanks of the bolt enhance its appearance and help minimize water seepage because they act in unison with the nuts in creating a tight seal. This U-bolt is 1 in. (25mm) high and the interior of the eye is 1 1/4 in. (32mm) wide. This is by far our most popular economy U-bolt.