Finger Screw with knurled surface

thingiverse

To create a reliable finger screw with an effective grip, I required a surface that provided a solid hold. Fortunately, I had some carriage bolts with a square neck that I believed would deliver a neat finish when pressed into the recess of the finger screw. Since my goal was to accommodate an M6x1mm bolt with a head diameter of approximately 15 mm, I designed this project accordingly.