CAN EASILY BE SECURELY FIXED IN PLACE. 12mm dia x 1mm thick Disc Steel Striker Round Metal Steel Disc Strike... Countersunk Steel Disc for Using Magnets, Hang Artwork or Noticeboards - 12mm dia x 2mm thick x 3., 2mm hole - Pack of 10 Kozelo 20pcs AXK1226 Thrust Needle Roller Bearings - [12mm Bore x 26mm 12mm Diameter Countersunk Steel Discs For Magnets Pack Of 10 Countersunk Steel Disc - 1-3/8 In. X 1/16 In. X 1/4 In. Hole Hang Artwork With Magnets They are an essential part of any crafting tool kit and are often used by galleries to hang artwork. 4mm dia x 2mm thick Neo hatch magnets 24 pack IDEAL FOR CRAFTING & DIY. For example, you could screw one of these discs into a wall and then, using magnets, hang artwork or noticeboards.