Description Product Reviews The 66M150 Block is the old standard for phone system installation connections. They provide connection and cable termination for many types of phone systems. Split block desight (the 2 columns of pins on the left are not connected to the 2 columns of pins on the right) Flame retardant Suitable for UTP cable Mounts on a 89B bracket sold separately. How to install a 66 block. 0 Reviews Hide Reviews Product Reviews