Perhaps just right the designation as "Eckspanner" no, rather it is a 3.Hand thus a not fall off the board. The Eckspanner keeps well in the corner, but not necessarily the way you want ... the 90 degrees are almost never achieved a zustätzlicher angle is being able to work in any case necessary to clean. Wolfcraft demonstrates the Eckspanner also bolted in T or corner joints. Such work is simply too inaccurate because the Eckspanner but yields something. For small handicrafts and small works certainly very practical, rather unsuitable for larger, heavier clamping plates.
