LS Series PCB spring terminal blocks, provide 2.54mm, 3.50mm, 5.00mm, 7.50mm, 7.62mm pitch. The single wire can be inserted directly, without the auxiliary handle. But the smaller wire can be clamped with handlebar clamp. No-key specifications reduce the height significantly. With screwdriver the wire can easily removed. Most of the spring terminal blocks are consituted by one or more pieces. This connection method is very suitable for wiring communications systems, lighting systems, control systems and the use of building wiring. Various wiring direction in tight spaces, can be contacete with any combination. They are easily to be operated, to meet the demand for high-density wiring.