Cannon Downriggers SS Low Profile Swivel Base. 5 degree . 316- grade stainless steel components and construction for added strength and corrosion resistance. Specifications for Cannon Stainless Steel Low Profile Swivel Base: Manufacturer: Cannon Size: One Size Features of Cannon Stainless Steel Low Profile Swivel Base Pre-drilled and tapped. Low profile design maximizes available space. Stainless Steel construction. Compatible with Universal Base and Tab Lock Base Package Contents: Cannon Stainless Steel Low Profile Swivel Base Cannon Downriggers 1903002: SS Low Profile Swivel Base