Retrieval and Metal Testing Magnet. Very, very powerful. We have mounted an extremely strong 1" diameter x 1/2" cylinder N52 grade neodymium-iron-boron magnet in 6061 aluminum for industrial and hobby use. It comes with an extra heavy duty split ring for attaching a hook, rope, wire, or fishing line. Here are some possible uses:*Hang stacks of paper or thick documents.*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)*Identify/sort some types of costume (fake) jewelry, which often uses steel as the base material under the plating.*Attach to your fishing line and cast away. You will find all sorts of sunken goodies. Bridges are an excellent place to go "magnet fishing". If you want to retrieve really big items (like engine blocks), use this magnet as an underwater finder, when it latches on to something, you can drop a very large normal magnet and pull up as much as you or your boat winch will lift.*Also handy for science experiments involving ferromagnetismThe magnet insert is rated at 54 lbs pull strength (as with all magnets, this rating depends on the magnet mating to a smooth, flat, unpainted steel surface, and this is NOT the same as the lifting power, which depends on a number of factors). The aluminum casing protects the magnet from chipping and breaking, and makes removing iron and steel shavings much easier. A removable vinyl cover is also included. We strongly recommend that you keep the vinyl cover on when not in use, and even in most cases that you are using it. These are made in the USA.Dimensions are:1-1/8" (30mm) diameter x 7/8" (22mm)tall head2" (50mm) overall length3/8" (10mm) diameter handle1/2" (12.5mm) diameter heavy-duty stainless steel split ring.