These 66 blocks have never been used--no punch downs have been made on them nor have they been mounted to any surfaces. Each has punch downs for 25 pair. One 66 block is pre-wired with a 25 pair female Amphenol (RJ 21) connector on the side. The others are two full blocks, not wired, same, shown in one photo. All blocks come with clear covers. Blocks are UL Listed. Also included is a bag of about 100 bridging clips to connect the right and left parts of a row on the 66 blocks. Manufacturer of the 66 blocks and clips is Siemon. These blocks can be used with any low voltage wiring system--phone or network circuits, model train track sections, security systems, etc. Cash only, no trades or exchanges, no shipping, pick up only in Orem or American Fork.