The 4080 HD aluminum extrusion belongs to the HD (heavy duty) family with an internal wall structure of 4mm. Regular extrusion are design with walls around 1.5-1.7mm thick for comparison. The structure of this extrusion makes it heavy as well due to the design which has been to accommodate higher loads and stress. The HD series of extrusions are more suited for the RoverCNC HD kits.
We do carry longer lengths, please contact us for a quote!
Note: The plates we sell have hole patterns that are primarily focus to support alternative extrusion with 20mm and 40mm hole specifications such as Part# 40-4080 from 8020.net at https://8020.net/40-4080.html.