Magnetic Copper Backer Set helps you weld without burning holes.
Two magnetic copper backing panels provide hands-free support when doing butt-welding or welding holes in sheet metal.
Use this hands-free, no-maintenance, backing support when butt-welding and welding holes in sheet metal or whenever an open area needs to be bridged with a weld. Magnetic panels hold tight on their own, and your welding material won't stick to the copper. 1/8"-(3.2mm) thick solid copper, with high-strength, high-heat magnets. Made in the USA.