Master 5422D portable push button lock box. Designed to lock over house door knob. 3 1/8" wide lock body with a 13/32" diameter shackle with 1 5/16" clearance. Body and shackle are plastic and vinyl coated to protect door. Inside measures 3 1/2" high x 2 1/4" wide by 1" deep. Push button locking with a code that can be reset up to 12 numbers/letters. Protective hinged plastic weather cover for push buttons.