These high speed steel drill bits are perfect for making precise, shallow holes in plastic models. At 1.5mm in diameter, the shank is wider than the bit, contributing to true rotation. Each bit has its diameter marked upon the shank for easy storage and selection. The bits can be used on materials such as plastic, wood, steel, brass and aluminum. ★Each bit comes with a plastic storage case. ★The image at right gives a comparison of the different Tamiya fine pivot drill bit sizes and specifications (current as of February 2022). ※Recommended for use with Fine Pin Vise D and Item 74112 Fine Pin Vise D-R. Fine Pivot Drill Bit sizes (PDF)