For the latest version see:
This is the lower vertex - upper and lower for the MendelMax 1.5
In the UK the 2020 Aluminium extrusion has slightly different ends which requires the ends to be tapped with M6 thread so these parts accommodate the added size.
Also the Lower Vertex - Lower has 25mm feet added to them which raises the MendelMax so you can fit cable conduit underneath to keep the cables safe.
This added height also works great with the Panelolu Box : http://www.thingiverse.com/thing:44398
Lower Vertex - Lower:
5x holes to fit M5 bolts
2x holes to fit M6 bolts
Lower Vertex - Upper:
4x holes to fit M5 bolts
1x hole underneath which fits M6 bolt and washer
Designed to accommodate the 2020 Aluminium extrusion available in the UK which due to its slightly different design means you need to tap the ends with an M6 thread.
These designs allow for M6 bolts to be used in the ends of the extrusion and M5 for T-nuts.