Plate I1 is usually used to build line motion mechanism,rocker mechanisms because it is specially designed with a long slot .
A long slot ( width:4mm, length:60mm )
18 M4 mounting holes compatible with most Makeblock components.
Aluminum extrusion (high strength),8msick, anodized surface(long time to shelve with barely rusting)
Plate I1-Blue (Pair)
Typicaly 1-2 days from payment confirmation.