Here in Hawaii, we use these sinkers for slide baiting fishing, going after the Giant Trevally. Most of the fishermen uses the 10 oz size and I drill out the holes to accept 12 gauge galvanized steel. Some likes the heavier gauge because of the strong currents, 50-80 lbs test lines and heavy baits weighing up to 5 lbs or more. The sinker needs to be anchored. I buy 100' rolls from Home Depot and cutting it to 25' lengths and then spinning them with a drill to stiffen it more.