The Universal Mounting Bracket allows the Desk Mate to be mounted on top of surfaces such as desk tops or shelfs. Tamper-proof screws provide additional security and portability between loctions situated with Deskmate other Mounting Brackets. For optimum security V-Line highly recommends all Security Cases be properly installed. Recommended installation hardware: 4 each A 1/4" x 1" - 1A 1/2" lag bolts and 4 each A 1/4" flat washers (not included). Includes one special wrench to install supplied tamper-proof screws. Specifications Model No. 2597-UB BLK Outer dimension: 8A 1/4" x 4" Ship Wt. 4 lbs.