Knurled grip enhances ability to pre-tighten with fingers prior to wrench tight Maintains ground continuity even when very loose Reduces errors/packet loss Integrated rubber port seal ensures proper moisture tight seal on every connection Usage: HD Over the Air Antenna - DirecTV / Dish Network, and Other Satellite Usage Approve - Ham Radio, Short Wave Antenna Usage - Cable Modem Internet - HD Digital Cable TV - Cellular Boost Antenna - Speed Sensor