spring clamp terminal blocks, spring clamp terminals strips with 3.81mm, 5.0mm, 7.5mm pitch:

The spring clamp terminal blocks is more strong, as it's including the spring contact and clamp inside to confirm the wires are connection tightly.

The spring clamp terminal blocks, spring clamp terminals strips have two pin header in the same line which to be soldered on the P.C Board, and the wire is parallel contacted with the pcb.