This is the famous COM8 Ankle lock, and acts lick a Achilles Tendon for your droid. Not only will it keep your outer foot shells even on the ground, it will allow you to do the 2 leg stand without falling over. Upper swivels mount to the existing hole in your COM-8 Frames ( not for Budget ) You will have to purchase the threaded rod sold at Lowes and Home depot. All instructions and hardware are included.
All Worr Parts are 100% American made !!!!