This thingy is a fuse holder for car fuse (regular type). and connector protector to prevent shorts. With the connector, I am using this thingy to make it a inline fuse holder. The connector i am using is solderless terminal disconnector,16-14AWG I was going to design a piece to cover the fuse too, but ended up only design the disconnector cover(since that is the only area exposing metal)Made using Sketchup