Are clamp-on swivels any good? Aluminum Boat & Jon/V Boat

Wise Boat Seat Clamp With Swivel

Boat Tote: Jon Boat Fishing Organizer

How to Install Swivel Plate & Boat Seat Kit - MARLON Jon Boats

Clamp on Boat Seat with Swivel – Better Boat

Sea Strike 12 Ft Semi Flat Aluminium Workboat - SeaStrike 12ft

Universal Swiveling Jon Boat Seat Bracket

BREMA 500 V EDGE Double Console boat

The Shoreline Marine Seat Bracket with swivel offers an adjustable clamp on style bracket and provides a 360 degree swivel. Includes a 7 x 7 swivel seat mount and installation hardware. Comes with vinyl coated clamps and adjusts from 7 to 20. Great for Jon boats and canoes.

Shoreline Marine Seat Bracket Jon Boat W- Swivel

Adjustable Boat Seat Clamp, Swivel Included