Modular Series Projector Mount Ceiling Kit Spider Universal Adaptor Plate extends up to 17.63" (448mm Easy installation of projectorup to either 39" (1m), 59" (1.5m),or 118" (3m) height Cathedral ceiling plate can be angled up to ±60° for use with vaulted or sloping ceilings Two adjustment knobs control tilt and roll image alignment and accurately hold image position, virtually eliminating any sag or drift with MOD-PRGSKIT models Three axes of independent adjustment enable precise image alignment with MOD-PRSSKIT models