Abstract: A headbox holder for use with a saw blade to cut a headbox for vertical blind according to the desired length is disclosed to include a main body, a mounting base extended outwards from the bottom side of the main body and adapted for supporting the main body on a worktable, an insertion slot extended through the front and back sides of the main body and adapted for receiving the headbox to be cut, a vertical cutting slot formed in the main body and vertically extended across the insertion slot for receiving the saw blade for cutting the headbox being inserted through the insertion slot.

Abstract: A headbox assembly for vertical blind is constructed to include a headbox having a track inside, a plurality of carriers slidably mounted in the track inside the headbox, an end bracket adapted for fastening to the headbox to close one end of the headbox, and a locating plate. The end bracket has a clamp inserted into one end of the headbox and adapted for holding a first one of the carriers. The locating plate is adapted for fastening to the headbox to fixedly secure the end bracket to one end of the headbox.