Universal fitment for most BenQ projectors under 55.1 lbs (25kg) Suitable for projectors with hanging holes within a size of 11.8in (L) x 9.8in (W). Adjustable Length 5 in (127.7mm) ~ 22.7 in (577.7mm); spaced every 1 in (25mm) Mounting arms must match projector mounting points. Your projector may use fewer arms.