Chief Rpa Elite Projector Hardware Mount Black (RSMA198) Compact design is smaller than the rpa by 1/3 and includes the same great features Independent Roll, pitch and Yaw for quick and precise Projector registration Quick connect/disconnect with convenient Lamp and filter access on most Projectors Disconnecting maintains registration and doesn't affect preset adjustments All-points security steel-into-steel locking hardware at all Connection points protects against theft