RJ45 Jack Covers, Black, Flush Mount, 100-Pack This cap protects open RJ45 connectors from physical damage, dust, dirt, grime, and liquids. Snap-in cover keeps jacks clean and covers unused ethernet ports  use for CAT5/5e/6/6a/7 ethernet jacks. Fits all standard RJ45 ports. Flush Mount. Quantity: 100; Color: Black