This is a powerful 1/2" diameter x 1/2" tall cylinder N52 grade neodymium-iron-boron magnet in a brass case for industrial and hobby use. It comes with an extra heavy duty split ring for attaching a belt loop, hook, rope, wire, fishing line, etc. There are many possible uses for this magnet:

Use to identify fake gold & silver jewelry at garage & estate sales before you buy
Identify/sort fake gold & silver jewelry, which often uses steel as the base material under the plating
Identify and sort steel grades and metal alloys that contain iron or cobalt
Identify/sort chrome plated items from polished aluminum, silver, and non-magnetic grades of stainless steel
Identify/sort solid brass and bronze from plated steel items (handy in the antique market and hardware store)
Hang stacks of paper or thick documents
Use with vinyl cap on to slide across the metal on a car to detect places where the metal was damaged and filled with bondo.
Great for Geocaching
Also handy for science experiments involving ferromagnetism

The magnet insert is rated at 18 lbs (as with all magnets, this rating depends on the magnet mating to a smooth, flat, unpainted steel surface).

The brass casing protects the magnet from chipping and breaking, and makes removing iron and steel shavings much easier. A tight fitting vinyl cap is also included to protect the magnet when it is not in use. This also helps keep the magnet from attracting iron dust and steel chips, as well as offering a little buffer to the magnet's strength when it is not being used. Caution: do not store this magnet near cell phones and credit cards. This size is a little too heavy for your key chain. Please browse my store for smaller magnets that are better suited for your key chain. MADE IN THE USA!

Dimensions are:
3/4" (19mm)diameter x 7/8" (22mm) tall head
2" (50mm)overall length
3/8" (10mm) diameter handle
1/2" (13mm) diameter heavy-duty stainless steel split ring

100% unconditional money back guarantee return policy!  Be sure to browse my store for other styles.