Pride Mobility Arm Rest & Accessory Lock Knob
Seat Arm Rest Securing Knob for Pride Mobility Scooters and powerchairs
A black thumb knob to secure arm rest to the seat base
This armrest lock Knob is used on most of Pride Mobility scooter Seats
Also used as an accessory tighten screw on the square tube at rear of scooter .
Thread size is 3/8" imperial