Every trapper knows how difficult it is to set a large trap alone in the woods, especially in cold weather, when the fingers are stiff, and the difficulty is greatly increased when one has to work in a boat. One of these clamps applied to each spring will by a few turns of the thumb-screws, bend the springs to their places, so that the pan may be adjusted without difficulty. No. 4 Clamp can be used on any trap smaller than No. 4 1 /2. No. 5 and 6 are strong clamps, carefully made and especially adapted to setting the large traps Nos. 4 1/2 to 6. They dispense with the inconvenient and dangerous use of levers. With them one can easily set these powerful traps. These clamps are also useful about camp for other purposes.