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The pick up weight of 50kg is aprox 150 lbs which is on the weak side for most who enjoy this hobby. Many at least try to get into the 250 lb range.
Actually, 50kg is only 110 lbs....not 150, so even weaker.
1kg = 2.2 lbs.
OK then, thank you for the reply bowwinkle, that pretty much sums it up, I've detected for 30yrs, but never "magnet" fished. Seems like another one of those "you never know" hobbies. I'll start on the smaller size, just to see if it's for me, and learn as I go.
I was an Industrial sales rep for 38 years and we sold Heavy duty magnets to coal mines for heavy trucks.The most popular ones we're the size you showed. They had a 1/4-20 hole in the middle for a 1/2" loom clip to attach. They used them anywhere on the heavy trucks to temporarily run add on lights or small hydro lines or for whatever reason. The 11/2" dia.were ample for hold. It took a large screwdriver to pry them off. High pressure water hose 3" in dia. Wouldn't tear them off. I have 5 in my shop using them to hang water hoses and various heavy things. I have even made a magnet fishing rope but haven't used it yet.I put a 3" X 1/4-20 solid eye bolt on it. In My best guess this would work in most cases for relic fishing. Industrial distributors sell these such as Granger or other suppliers. Prices are on the salty side. We sold them in the 11/2 dia. Size for around $23 bucks.Sizes like 2" to 4" are also available but the larger sizes might get hung up easier. Just my opinion.