RACK ENCLOSURE CABINET 2-PACK DOOR HANDLES W/ COMBINATION LOCK. Tripp Lite Rack Enclosure Cabinet 2pack Door Handles w/ Combination Lock SRCOMBO. This replacement combo handle allows facility managers to closely guard access to specific cabinets. Combos can be easily changed when access requirements change but retains a key override for management. SmartRack Combination Lock For Door. 2 x Combo Handles. Installation Instructions and Lock User Manual (for changing combos).