Measurements of the Subframe Hexhead Screws A Subframe Hexhead Screw set is supplied with 6.3 x 90mm subframe hex-head screws for the Millboard Plas-Pro subframes. With the pre-drilled hole in your subframe, these sturdy hex-flange head screws reduce drive torque due to their type 17 gash point. What colours are available? We currently supply subframe hex-head screws in a dark brown shade, which seamlessly fit and disappear into your subframe structure. Although the shades may alter slightly, there are minimal differences, and they won't affect the aesthetics of your structure.
