suitable for KS3 +. Ray Box - All metal Ventilated Lamp House with an open front and extended sides finned externally for heat dissipation and vertical internal grooves to accommodate a slit plate and cylindrical lens. 12 volts lamp and one meter twin flex with plugs. Complete with slit plate with single and triple slits. Spare Bulb Holder for Raybox. Complete with 1 Metre Flex with Two 4mm Plugs.