Get a better bite on your spindle with the crown drive cetnre. More teeth give a better grip while providing equal pressure and a positive drive. There is no need to hammer your drive center into the work piece and risk splitting your work. A spring loaded point simplifies the positioning of your spindle in the center and retracts to avoid spitting your work when tailstock pressure is applied.
Two head sizes are available - both in industry-standard #2 morse tapers.