This is a very nice tool that is equipped with both a seam ripper and a stiletto! Use the ridged silicone end for grabbing and brushing away snipped threads. The stiletto is handy for moving fabric under the presser foot as you sew and/or for poking holes as needed. The smooth, non-slip handle is very nice in your hand.
I don't show this particular ripper in the video below, but you might find the info on rippers in general to be helpful.