Magnets are the workhorse of Retrieval Tools, you just have to get close to a steel object and it will latch on. There are plenty of non-magnetic items that have been retrieved but this is the quickest , simplest tool to try first. Magnets come is different diameters and strengths, the higher the optimal lift rating, the heavier the object it can grab on to. Optimal lift is the maximum attraction the magnet will have with full contact to a thick magnetic object. Less than optimal results can be encountered if the object is thin, coated, or not fully magnetic, such as some stainless steel and other alloys. Be careful though, powerful magnets be difficult to maneuver in pipe and vessels that are magnetic themselves.