Extra Fine Extender Tip - #302For use over the standard #312 top, it allows BSIs thin CAs (Insta-Cure, Insta-Flex and Super-Gold) to be applied a drop at a time.Thin CA tends to run everywhere, so these allow precise application. Cut the flexible tip to the length and/or inside diameter that you need for a particular application. Then squeeze the bulb and insert the tip into an open CA bottle to draw out the amount you need. When using the teflon tubing, cut one end at a 45º angle before inserting no more than into the bottle top. 6 extra fine tip extenders..