Vibration Dampening U-Bolt Vibration-Damping U-Bolt 316 Stainless Steel Finish Plain Thread Size 1/2 In.-13 Thread Length 1 1/2 in Inside Length 5 3/64 in Length (In.) 5 45/64 in Inside Width 4 1/2 in Pipe Size (In.) 3 1/2 in Characteristics Cushion Design Provides Total Load Distribution Includes Cushion Two Nylon Lock Nuts U-Bolt