Leviton 40066-M50 Split M Block: 50-Pair (66M1-50) 10-inch H X 3-5/16-inch W X 1-3/16-inch D Install individually or in pairs in cross-connect system High impact fire retardant UL-94V0 plastic Phosphor bronze quick-connect insulation displacement 66-clips 25 and split 50-pair styles Accessories available (purchased separately): covers, brackets, wire distribution spools, adapters and bridging clips