The CMTB1 consists of two parts, the top plate and the bottom plate which are essential components for any of the ceiling mount solutions.
The top plate is made of heavy duty 5mm thick steel, designed to be bolted onto a joist/beam and is also suitable for pitched ceilings. The CMPFA (adaptor for PF1, PT1, VPT1, CMTB1, FT1, VFT1) and CMVA(for direct fixing to plate for 75, 100, 200x200, 200x100 VESA standards) can be attached to the bottom plate allowing you to mount screen sizes from 15" to 55".