Makeblock Beam0808 is One of the most frequently used part in Makeblock platform, it compatible with most makeblock motion and Structure components. 
 
Features:
Made from 6061 aluminum extrusion, anodized surface. Excellent strength and twist resistance.
With holes on 16mm increments, can be drilled for 4mm hardware.
Threaded slot enables easy and flexible connection.
Cross-sectional area 8x8mm, length 504mm.
Sold in Pair.