Eastwood 4 inch Magnetic Copper Welding Backer - Welder Tool
Use as a hands-free backing support when butt-welding and welding holes in sheet metal or whenever an open area needs to be bridged with weld. Welding material will not stick to the copper plate. 2"x 4" x 1/8" solid copper with high-strength, high heat magnets. Made in USA.Listing is for one 2" x 4" magnetic backer.