You are buying 1 aluminum beam precision made of 6061 light weight aircraft
grade aluminum. Made for high strength scaled moc-ups, physics experiments, or
robotics, where an all plastic creation may not hold up. Works with Technical
gears, and have 31 holes at 8 mm spacing. Adding aluminum metal to a
construction kit requires adult supervision, because its increase strength,
leverage, and the ability to move heavy objects and do real world task. We
custom CNC machine anything.