The weBoost 905814 3/8 in. NMO Mount with 14ft RG58U Cable and SMA Male Connector is for use with vehicle NMO non-magnet mount cell phone signal booster antennas. It requires a 3/8 in. hole in the sheet metal surface for connection. This is for a permanent installation. . Requires 3/8" hole in sheet-metal surface for connection . Permanent hole mount