Tripp Lite's D10B2 offers data line surge suppression for 10Base-2 (thin coax) ethernet network interface cards, bridges and routers, plus IBM 3270 and CCTV lines. Includes BNC coax male to female connections allow convenient placement at the protected device network connection. Surge suppression is handled with balanced arrays of high-speed avalanche diodes that divert excess energies created by electrostatic discharges, faulty wiring or lightning away from network interface connections. Tripp Lite network surge suppressors reduce blown NIC cards, garbled network transmissions, system lock-ups and hard equipment failure by safely shunting dataline surges to ground. Six inch heavy guage grounding lead connects to designated grounding lugs available on the back panel of most network workstations and pieces of internetworking equipment. Lifetime warranty.SUPPRESSION: 1 set BNC Coax (male/female), protects center, shield & chassis, 7.5V clamping.