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 1/4 inch wide leaf springs and are 11 inch extra-long measured from the bottom of the bend to the bottom of the threads with 9/16 Inch Thread Pitch. 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. thread can be cut down to fit many applications.