The best drill blades specially for modeling and focusing on function to use with pin vise.<br/> The best length for using with pin vise.<br/> Smooth cutting obtuse angle edge.<br/> Obtuse angle Drill Bit drills smoothly, not shaky, and easy to drill almost perfect circle.<br/> Drill Bit set of 5, 1.0, 1.5, 2.0, 2.5, 3.0mm diameter.