Reliable 28mm Rear Bumper Keeper Kit with Aluminum ClampsPicture this: you're neck and neck with the leader, but a loose bolt sends your rear bumper flyinggame over with a black flag. Enter the BKK 28MM Rear Bumper Keeper Kit for 28mm frame rails, your ultimate insurance against such chaos in CIK sprint racing. Sold as a pair, this innovative kit includes high strength aluminum clamps that grip securely around your frame. If disaster strikes and a bolt fails, these keepers maintain the upright's position,