Neodymmagnet, All you need...

Shape: Ring
Outer diameter: 60 mm
Inner diameter: 6 mm
Height: 30 mm
Tolerance: +/- 0.1 mm
Weight: 620 g
Coating: Nickel-plated (Ni-Cu-Ni)
Magnetisation: N45
Strength: approx. 120 Kg
Max. working temperature: 80°C
60 mm 30 mm
"One Ring to rule them all, One Ring to find them. One Ring to bring them all and in the darkness bind them."
A giant ring (actually closer to a disc with a drill hole), that is suitable for tying with a piece of cord. You can use this to fish your bicycle (and who knows what else) out of the river without a problem. Other uses: your keychain out of a gully or Euro coins out of a pond.
This ring is dangerous and not suitable for children or any kind of "joke usage", as it can seriously pinch fingers or lead to any number of injuries. If you don't have any experience with neodymium magnets, please buy a smaller magnet first.
(cord not included)