L-Com EC412F RJ21 Telco Harmonica Female 50-pin break out to RJ11 (6P4C) x 12 ports PN-phB-xxx Specifications: Breakout 50-pin Telco RJ21 style connectors to 12 6P4C wired RJ11 jacks Includes hook and loop style hold-down straps to eliminate screw tightening Two holes for mounting to a wall or panel Includes double-sided foam tape for mounting convenience USOC Wired for most telephone applications