So, what is an LDU precisely? It’s the smallest incremental size used to define LEGO’s dimensions. For context, a standard LEGO brick is 20 LDUs wide, and a single plate is 8 LDUs tall.

Set: #42179 Age Range: 10+ Piece Count: 526 Dimensions ... rapidly in the last several years. The rods and pins are part of nearly every "traditional" LEGO brick set, adding mechanical function ...