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Nickel Plated Mild Steel Disc with 3M Self Adhesive for Arts, Crafts, Model Making, DIY and Hobbies - 20mm dia x 2mm thick - Pack of 200 IDEAL SURFACE FOR MAGNETS TO ATTRACT TO. These steel discs are the perfect solution for installing a magnetic surface that magnets will stick to. For example, you could screw one of these discs into a wall and then, using magnets, hang artwork or... Nickel Plated Mild Steel Disc with 3M Self Adhesive for Arts, Crafts, Model Making, DIY and Hobbies - 20mm dia x 2mm thick - Pack of 200