icengineworks Tack Welding Clamps allow for easy tack-welding of your tubular exhaust assemblies. No more burned fingers, misaligned jounts, or endlessly marking witness lines. icengineworks clamps create smooth concentric joints (straight-to-straight, straight-to-bend, and even bend-to-bend) that are easily adjusted for best fitment. Once the metal assembly matches your plastic model, tighten the clamps and tack-weld all the joints at once. Then, simply slide the clamps off the assembly and proceed to weld each joint with total piece of mind. These tack welding clamps feature 100% polished stainless steel construction. Sold in sets of 4 or 8.