5eBoard Reconfigurable Solderless Circuit Breadboard 4x6 Professional Kit – Blue/White

I like that I can place the "assembly block" nodes most anywhere in either orientation. They can be color coded or marked. Nice variety of colors for base boards and assembly blocks. Cheap to deploy without "wasting" a whole protoboard. No mounting holes but you can use double-stick tape or foam. You can no doubt drill the conductor-less base boards for mounting or cut to size for custom installations.

Tight tolerances. High quality plastic. Time saver. Good product.

Little smaller than I thought it would be.