Some of you were right on the money, it is: a Phillips Detachable Golf Spikes, tool. C.C.Phillips inc. Stoughton, Mass. In the handle are another pair of pins, the knurled nut on the business end unscrews, lifts up to replace the pins. When I saw it I thought of a particular task it would work for, but when I got home, found it was just a bit too large. Real good guesses!!