On one side of a ravine on the Big Island of Hawaii, where bottle hunters have been rooting around, I noticed this object. Yes I handled it to get some pictures. Probably not too smart of me, but its about 15" long and 4" in diameter. Black plastic covers the top half and a stainless steel screw assembly sits on the tip. Quite heavy for an item of this size -- I'd guess 15 lbs. Anyone got any ideas?