As has been pointed out, this is a shear matrix.
Having said that, I don't think any part would ever be held due to not using a sheared box primitive in a place where it is possible. To a certain extent, this usage of box could almost be seen a showing off by the part author.
Having said that, I don't think any part would ever be held due to not using a sheared box primitive in a place where it is possible. To a certain extent, this usage of box could almost be seen a showing off by the part author.