The best drill blades specially for modeling and focusing on function to use with pin vise.
The best length for using with pin vise and smooth cutting obtuse angle edge.
Obtuse angle Drill Bit drills smoothly, not shaky, and easy to drill almost perfect circle.

• Diameter bits in sizes  1.1, 1.2, 1.3, 1.4, 1.6, 1.7, 1.8, 1.9mm diameter
• Suits pin vises accepting bits with 3mm axis