I am a hobby carpenter. I built a jig that would require a T-rail and some handles. Since I have a 3D printer I was able to make my own pens. But sometimes the time and expense, and your enthusiasm, outweigh the DIY. So I decided to order this set of handles and screws. I ended up using 3 of those knobs and screws "as is". I used 2 more handles and bought shorter screws for a different attachment. Good quality. Check out the great pen prices and I think you will buy something like this. 1/4-20 seems to be the standard for T-Track.
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