It's useful to have a mount for printed circuit boards, so you don't have to screw them onto something. There are three models here, one for the MSS-Crossover (which just detects current draw and passes it on to the surrounding MSS-equipped models. The other two are for the MSS-CASCADE-BASIC, which has two current sensing boards, and one signal controller board.

Designed to use press-in 3mm screw bosses.