Very good for silicone sealant in hard to reach places. I wanted the tip to be cut straight so as not to stretch the sealing layer. He did exactly what I needed. Sticks very well to the tube. Didn't have to use tape or glue like some reviews suggested, I just taped it in place and it never came loose. It also took me a few days to get the job done and while I expected to need all the tips I only used one for the whole job. Highly recommended.