L-com's exclusive rack mounted harmonica cluster bars organize all your telecom cables into a convenient rack mounted panel. Each panel uses two, 12-port 10Base-T wired harmonica cluster bars with a Telco RJ21 50-pin connector on the back. Each panel is constructed with black powder coated steel with screened write-on spaces for years of reliable service. Each RJ21 Telco connector is secured to the back of the cluster bars with a hook and loop style strap. No more splicing required, use L-com's cluster bar panels and avoid connection failures.