Used for 4" charge air cooler tubing.BREEZE B9224-0411 - Heavy Duty Spring Loaded T-Bolt ClampThe clamp has a minimum size of 3-1/16" and a maximum size of 3-3/8"4" Max. Heavy Duty Spring Loaded T-Bolt Clamp$11.99PriceExcluding Sales Tax | Pick Up and DeliveryOut of Stock