Trac-Lock III 2-3/8" Swivel Locking

Swivel seat mount rotates 360 degrees and automatically locks in the straightforward position 

Dimensions:  6-5/8" X 6-5/8"

Mounting Slots Pattern:  4-1/8" to 5-1/2"

Just pull upward on the locking handle to rotate swivel, flip the same handle down in the neutral position for free roatating.