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 1/2 in Length (In.) 6 5/32 in Inside Width 5 in Pipe Size (In.) 4 in Characteristics Cushion Design Provides Total Load Distribution Includes Cushion Two Nylon Lock Nuts U-Bolt