Vibration Dampening U-Bolt Vibration-Damping U-Bolt 316 Stainless Steel Finish Plain Thread Size 1/2 In.-13 Thread Length 1 13/32 in Inside Length 4 35/64 in Length (In.) 5 3/64 in Inside Width 4 in Pipe Size (In.) 3 in Characteristics Cushion Design Provides Total Load Distribution Includes Cushion Two Nylon Lock Nuts U-Bolt