Master Lock 5400D Portable Lock Box 

• Over the Door Knob Design for Portable Installation
• Resettable 4-Digit Combination for Increased Security
  
• Set-Your-Own Combination for Keyless Convenience
• Large Internal Cavity Prevents Jamming Even with Multiple Keys
• Protective Weather Cover Prevents Freezing and Jamming; Molded Body and Vinyl Coated Shackle Prevent Scratching
• Internal Dimensions: 3-1/2" (89mm) H x 2-3/4" (70mm) W x 1" (25mm) D
• Specs_Width: 3-1/4" Wide: A: 13/32" (10mm) B: 1-13/32" (36mm) C: 1-7/8" (48mm)
• Best Used For:Real Estate Access Control, Spare Key Storage & Access Card Storage, Security Gates & Fences