The British Rat Trap Company

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Fenn Trap Mk4

These Mk4 Fenn traps are designed to kill, they will break bones in your hand, if you don’t understand their use or how to properly set a Fenn Trap don’t buy these traps. All that said the Mk4 Fenn spring trap is designed and approved to kill grey squirrels, rats, stoats and to a lesser extent mink.



  • Mice
  • Rats
  • Squirrels

The Fenn Mark 4 Rat Trap manufactured in the U.K., measures 4.9″W x 5.3″H x 4.72″L when closed. The Fenn Mark 4 is a lethal, body-gripping rat trap which should be set in a natural or artificial tunnel or enclosure to avoid non-target captures.



Made for professionals

The trap must be set in a natural or artificial tunnel which is suitable for minimizing the chances of injuring or killing non-target species whilst not compromising the capture and killing of target species.

Lucas Geer

Worked well very effective little mess and easy to dispose of the pests

DimensionsClosed: 125mm wide x 135mm high x 120mm long Set: 140mm wide x 50mm high x 120mm long
Weight380grams / 13.5 Ounces
MaterialsJaw Wires: BS1052 Galvanized Mild Steel Base and Trap Plate: EN10270-1 SM Galvanized Springs: EN10270-1 SM Galvanized Flat Jaws: CR1 Chains: Zinc Plated Brass Parts: EN1652 1998 CW508L CZ108 H/Hard 22080310
SafetyThe spring on this trap is very powerful. Under no circumstances allow body parts past the tunnel entrance once set. ALWAYS USE THE SAFETY CATCH!! This trap potentially has the power to break the bones in a human hand! Always correctly position and protect your spring traps from non-target species. Regularly check traps in accordance with current legislation and risk-assess potential sites to avoid accidents.
Setup InstructionsMK4 Fenn Brochure
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