My contractor has installed what he claims is a ceiling fan rated mount in the bedroom of my addition. I went into the attic and it is mounted to a rafter. It seems to be well mounted. My problem is that it did not come with any screws to mount the ceiling fan to it. I do not know what screws to use in it or if this is a good box to actually have. The box is plastic. Many other forums say to never use plastic. There is a metal bracket that mounts the plastic box to the rafter. It appears that a #8 or #10 screw would do. Anyone seen this type of mount before?