This is the best thing since sliced bread! My daughter brought it home for me; it is a tool used by the beauty salon for getting hair color out of a tube! I am working on the large glass-on-glass outdoor totem and I used only about a fourth of the first tube of GE Silicone II and then it got too hard to squeeze out of the tube, so I cut the tube open and put all the silicone into a small glass jar with a tight fitting lid but it got solid and rubbery and had to be thrown away. This tool enables me to squeeze out a little at a time. It is wonderful. You can order one online at beauty supply places, just type in "tube key." They are very inexpensive.