Springfields 1615201-EC KingPin Swivel Seat Mount features a 7 in. square swivel that rotates a full 360 degree. Use with any Thread-Lock Fixed Height Post for fishing use. Rust-resistant E-coat finish. Features Unintentional Detachment To Comply With ABYC Polished Passivated Swivels Are Stainless Steel Fits Bolt Pattern 45 x 55 Square, Rotates 360 degree Patented Design For Optimal Strength Specifications Color Family: Black Finish: E-Coated Pin: 3/4" Spring adds: 1.5" H Angle: 360 Degree Size: 7" x 7"