4- and 8-inch Magnetic Copper Butt-Weld Backer Set
Product Review (submitted on March 29, 2011):
I had the magnets pull out after getting the copper hot from welding too and the magnets seemed to have lost their magnetism after that also. The copper is heavy and works well to weld against but as has been stated, they don't bend and I find thier use limited. I bought 2 large, flat magnets to hold the plates in place and have also used clamps to hold them. I will be purchasing the flexible wedges for use on fender repair for better contour conformity.