Features:

Black finished, Heavy duty powder coated steel

Swivels 360-degrees ball bearing 

Self-lubricated, non-corrosive, poly swivel bearing heavily plated steel to resist corrosion

Perfect for marines seats or barstool or your DIY chair projects

Mounting screws are not included

Specifications:

5" hole pattern fits most seats

6 1/8" x 6 1/8" x 7/8" thick

Package included:

1 x Seat Swivel Base