Arm Rest & Accessory Lock Knob M8
Seat Arm Rest Securing Knob for Size M8
A black thumb knob to secure arm rest to the seat base
This armrest lock Knob is used on some Powerchairs
Also used as an accessory tighten screw on the square tube at rear of scooter .
Thread size is M8. Note this is coarse pitch thread
Fits Rascal 321 Powerchair