Stopper screws for rollator seat brackets. 2 Pack, Rollator Replacement Parts.
For the Medline Steel Rolling Walker Rollator MDS86850ESKD, 
the Medline Aluminum Rollator Walker with 6 " wheels MDS86850E
the Medline Basic Steel Rollator Walker with 6 " wheels MDS86830EBLS
and the Medline Basic Steel Rollator with 8 " Wheels MDS86850EBS8
NEW. 
Medline brand

For 3/4 " DIAMETER tube. 
For the Medline seat size  12 " x 12 " x 1 "
The seat and the brackets in the pictures are NOT INCLUDED