Torx 25 screwdriver

This tool can be used to tighten the self-tapping screws:

You need to tighten the self-tapping screws through holes in the aluminium profile. You need this, or a similar one-piece driver for the task. Note, that a exchangeable tip (like in a power screwdrivers) will not do - the aluminium profiles are not big enough to allow large enough holes for a tip holder.

NOTE: Please note that I am unable to offer a good price on this, the tool is offered for convenience only. Especially, ordering this alone does not make sense to you. You can purchase this same tool from Element14; their part number for this is 4432939. Also, you are likely to find a similar tool from a well-stocked local tool shop.