For many years we used pluggable spring clamp terminal blocks for our Industrial Bricklets. When these blocks are used with the correct wire (correct wire gauge), they are really easy to use. But if the wire has a small diameter or it is a stranded wire a screw driver has to be used to connect the wire to the terminal block. Sometimes that is not easy and we often got the feedback that our users would rather use screw terminals. Because of that we are now shipping the Industrial Bricklets with a new type of screw clamp terminal block connector. As the name suggests the wire is connected with a screw type terminal block. The spring type connector is still available in our shop.