4x50, 25-pair, 4-clip, 66M connecting block, includes 1 designation strips. 25 Pair Connecting Block with 4 Clip Terminal offers increased flexibility of wiring arrangements and reduced costs where fewer distribution terminals are needed. Intended for use in wire terminating arrangements of cables and key telephone systems. Blocks are molded or flame retardant thermoplastic with quick-connect 66 clips for ease of installation and proven termination reliability Made of molded plastic Overall dimensions are 10inch x 2-9/16inch x 1-3/16inch