4190 Rail MountRatchet action, designed for quick and easy installation on 7/8 and 1 in. vertical or horizontal rails. Handles antennas up to 8 ft Special cable slot eliminates removal of most factory-installed connectors Standard 1in.-14 thread (male) Construction: Stainless steel Mount type: Rail Cable pass through: Special Cable Slot Specifications:Type: Mounting BracketsBox Dimensions: 3″H x 3″W x 5″L WT: 1.3 lbsUPC: 719441110253Quick Guide (pdf)