This grommet style loop, round fastener, used at lower edge of top's rear curtain along the buggy rail. 1-1/8" diameter. 
It holds the curtain to the buggy rail. 
Includes the Inner and outer rings of the grommet loop, painted black, and a round piece of black leather which placed between them. 
NOTE: Used with RW-SK steel knob stud, (not included)