The PL1 provides extra defense against theft beyond Chief’s standard All-Points Security without the extreme of enclosing the entire projector mount.Features:- Includes key option "A" keyed lock for an added level of security.- Choice of three unique locking configurations (indicate PL1A, PL1B, PL1C).- Maintains convenient lamp and filter access for hassle-free maintenance.- Compact design for a discrete appearance.- Sliding access doors make projector maintenance quick and easy.- Slotted design for proper projector ventilation.- Compatible with new or existing RPA series installations.- Allows standard routing of cables through 1.5" NPT pipe.- Ships fully assembled.