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Single Spring No. 21½ has a spread of jaws of 5¼ inches. This trap is the same as No. 2½ but is without teeth or Raised Plate as some trappers prefer it in this style.

No. 31½ Newhouse Trap is also a single spring being same as No. 3½ but without Teeth or Raised Plate. Spread of jaws 6½ inches.

These traps, Nos. 21½ and 31½, are the largest smooth jaw, single spring sizes that are made. Professional trappers will find them especially valuable when on a long trapping line, as they are more compact and easier to secrete than double spring traps. The springs on these traps are made extra heavy.

The No. 21½ is practically a single spring No. 3 and the No. 31½ a single spring No. 4. These traps are used for such animals as otter, beaver, wolf, wolverine, fisher and have been known to catch and hold Mountain Lion.