Cannon AlumInum Swivel Base Pedestal Mount 4in. 5 degree . The top plate is pre-drilled and tapped for mounting Cannon downriggers (and other downrigger brands). Specifications for Cannon AlumInum Swivel Base Pedestal Mount: Manufacturer: Cannon Length: 4 in Fabric/Material: Aluminum Features of Cannon AlumInum Swivel Base Pedestal Mount Pre-drilled and tapped. Constructed from high-grade aluminum. Accepts most downriggers. Package Contents: Cannon AlumInum Swivel Base Pedestal Mount Cannon 1904032: AlumInum Swivel Base Pedestal Mount 4in