Vibration Dampening U-Bolt Vibration-Damping U-Bolt Steel Finish Zinc Plated Thread Size 1/2 In.-13 Thread Length 1 13/32 in Inside Length 3 29/32 in Length (In.) 4 7/16 in Inside Width 3 3/8 in Pipe Size (In.) 2 1/2 in Characteristics Cushion Design Provides Total Load Distribution Includes Cushion Two Nylon Lock Nuts U-Bolt