The Bowman Style Rodent Restrainer holds rodents up to 750g. Rodents can be placed by removing the upper rods and replacing them after insertion. Alternatively, they can be placed through an access porthole in the rear. The front “guillotine” door can be adjusted and locked into three possible positions. This door has stainless steel “spring loaded” lock. Suction cup feet on the white plastic base secure the device during use.