For a truly useful tool when assembling electronics, the PCBGrip Standard Kit has pretty much all you'll need.
No matter how big your electronics bench is, it always comes down to the one-square-foot area in front of your chair where you get the work done. PCBGrip is a modular PCB holding and testing system utilizing Openbeam to offer the most flexibility in holding, mounting, adjusting, and...well, gripping your circuit board and electronic parts.
PCBGrip started as a successful Kickstarter campaign, which Solarbotics supported. We're happy to be now carrying the PCBGrip line for our customers too! We're a bit biased about it, as we've been long supporters of the Openbeam aluminum extrusions it uses.
Also, yes, it uses metric hardware, which we're finding to be more and more prevalent in hardware these days. Fortunately, there's so much included in this kit, you have no risk of running short. A beautiful Wera hand driver is included too.