This 20×40 V Slot Aluminium Extrusion Profile made from high-quality Aluminium Alloy 6063. 
The dimensions are as per European Standard and the structural cross-section thickness is minimum of 1.5 mm.
V Slot is an improved form of T Slot Aluminium Extrusion Profiles as it combines functionality of T Slot with added advantage of linear motion.
V Slot and T Slot use common hardware like T Nuts, Joining Plates etc.
The profile can be used for structural elements in automation machinery, laser cutting machines or 3d printers.
Note: There may be dimensional tolerance of ± 2 mm in length.