*FITS HEAVY HITTER XL DOWNSTEMS & SMALL COILS. CLIPS ARE NOT ELIGIBLE FOR RETURN* This will not fit normal sized tubes. All normal sized tubes take 19/22 Plastic clips have been used in scientific glass for many years to hold ground glass joints together and to prevent unintentional dislodging. Illadelph has developed special clips to match the company’s heavy wall weight joints which prominently display the Illadelph registered trademark. With the addition of a new heavy-duty magnetic clip for the full-sized detachable coil, Illadelph has established an all-inclusive line of clips available in all colors and sizes.