110 block

A 110 block is a punch-down block used to connect wiring for telephone systems, data network wiring, and other low-voltage wiring applications.
The 110 block improves on the 66 block by supporting higher frequencies and using space more efficiently.
A punch-down tool is used to force solid wire into metal slots on the 110 block.

A 110 block is a type of punch block used to connect sets of wires in a structured cabling system. 110 is also used to describe a type of Insulation-displacement connector used to terminate twisted-pair cables which uses the same punchdown tool as the 110 block.