Round Super Magnet
These round, rare earth Neodymium super magnets, are 1" in diameter, 3/16" thick and incredibly strong (over 20 lbs. of pull).
They attach easily to the head of a pick or can be attached via the counter sunk hole (fits size #10 screw) in their center to wooden tools or pick handles. Used for picking up iron trash and magnetic hot rocks when metal detecting, they are a real back saver.
Just be careful! They are powerful magnets and can shatter upon impact with one another.
As a side note, these are also incredibly handy as stud finders in home remodeling. They grab onto the heads of drywall screws/nails, making it easy to reliably mark the stud.
Note: photo is slightly thicker version.