Bought this to install an NMO antenna Wishring HH-N2RS Dual Band Automotive Cellular Antenna UHF VHF 400-470 136-174MHz NMO. The bracket was very tight on the hole but it didn't leak at all. Tram 1250 NMO 3/4" 17ft RG58 Coax Rooftop Antenna with UHF PL259 Connector for Yaesu Kenwood HYT Vertex Icom Cellular Devices. The bit was easy to use and cut a very clean hole in my F150.