These Stainless Steel Flat Band Clamps are top of the line and ready to fix, repair, or fpor your custom Exhaust System. Buy 1 or both for this low price each. 2-1/4 inch or 3-1/4 inch diameter pipes to attach. napa part numbers 733-5621 / 733-5415 .Full instructions on back of Package. Butt Joint Sleeve Coupler Ex Sealing . Call (952)854-5 seven eight six