The Harris plastic rat trap offers reliable construction, quick and easy trapping, and is a very cost-effective way to rid your home of rats. Instruction Steps: 1) Remove bait holder from the base by twisting anti-clockwise. Place bait in the holder and replace securely. 2) Use hand or foot to press down the grip until setting mechanism clicks into locked position. 3) Place the baited, armed trap where evidence of rodent activity is noticed.