The Quick Release Mounting Bracket Works with models 2912, and 3912. Mounting Bracket allows your Top Draw Case to be transported. Lock tabs and thumb screws allow easy transfers, no tools are necessary to transfer case between brackets. Pre-punched holes enable the case to be installed directly to most surfaces. For optimum security V-Line Ind. highly recommends all Security Cases be properly installed. Recommended installation hardware: 4 each ¼" x 1" - 1½" lag bolts and 4 each ¼" flat washers (not included).