Overstitcher and Pricking Wheels
Overstitchers
Overstitch wheels are used to make spacing marks to aid in even hand-stitching and then to roll over the finished stitches to help "set" them. They have a rounded profile between the points to round up the stitch appearance as well.
Gomph Overstitchers
HF Osborne Overstitchers
CS Osborne Overstitchers
Other Maker Overstitchers
Pricking Wheels
Pricking wheels are also used to make spacing marks for hand-sewing. Generally speaking the points are a little sharper and more distinct than an overstitching wheel. Many who hand sew prefer a pricking wheel for that reason.