Neodymium Ring Magnets with Hole - Magnetic Bore 12 mm - Round Ring Magnet 50 mm x 8 mm Disc Magnets Strong - Flat Round Strong : Amazon.de: Stationery & Office Supplies
Round chuck - magnet.works
D5 x 15 / N35 - NdFeB (neodymium) magnet
50mm Rund (Magnet-Slot + 3x Bolt + optional Miniature-Slot)-(1x)
60mm Rund (Magnet-Slot + 3x Bolt + optional Miniature-Slot)-(2x)
Neodymium Rubber Coated Round Base Magnet w/ Female Thread