American Automotive u bolts are manufactured for maximum clamp force and are guaranteed for life. Made of cold drawn certified 1541 carbon steel OEM factory material with grade 8 hardware, American u bolts embody extreme strength and maintain OEM handling characteristics. These round u bolts are engineered to clamp 3.25 inch wide leaf springs and are 11 inch extra-long measured from the bottom of the bend to the bottom of the threads. American u-bolts provide an even distribution of pressure to protect against premature spring failure and unwanted movement. Allowances need to be made for all overloads and aftermarket leafs. 4 inch thread can be cut down to fit many applications