Bass Pro Shops Powder-Coated Seat Mount uses a 3/4 pin system and is coated to resist corrosion. For easy installation, it features a standard mounting-hole pattern. The mount allows you to rotate your seat 360 and tilt it 3. Meets ABYC standard H-31 Type B seating. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Pedestal Seat Base.