nodeko knicki-rapid glider with pleat hook. nodeko describe their retrofit gliders as rapid, i.e. they can be fitted quickly, no need to inserted from the end of the track. These gliders are simply pushed into the track and turned through 90°. This version incorporated a secure pleat hook. By secure I mean that it can be locked into the closed position with a clip.
NOTE sold in quantities of 1, photo for illustration.