This is a connectable crawler tile - this tile locks into other tiles like it so that when moving betweent tiles, they do not move and shift apart.  There are other creators here with connectable tiles as well!

Some that I have liked are:  some by @StevenDH here and there are many others like a set here by @magicfilament here.

This is printed at .30 with a neat material that I tried, and I like it so far!  The material is the Rock PLA by Overture - Alpine Forest.  I really like the result, and this material has sand/grit, so works great to use for these!  

The Jeep in the pictures is a 1/30th Axial SCX30 - I find this scale to be the most fun and challenging, however the SCX24 and TRX4M can also have fun on these connectable tile sets.