29 Holes measurement: 29-hole sizes remain constant, providing precision accuracy; The drill sizes in both inches and decimal equivalents, equivalents range from 1/16 inch to 1/2 inch by 1/64 inch, come with clearly marked fractions and decimal for accurate measurement Exquisite design: heavy gauge steel construction is machined and ground to close tolerances, it can quickly and conveniently identify drill bit diameter; With a hanging hole design for easy hanging, which provides convenience for your work Durable material: well constructed of stainless steel, it is sturdy and durable, helps to gauge the drill bits quickly and easily when working with older, unmarked drill bits and bits that are too small to fit diameter markings, practical equipment tools box Package includes: you will receive bolt and wire diameter index gauge, it has been clearly imprinted with black graduations to give high contrast, will not wear off, a practical helper for measurement Proper size: you can carry it in your bag as a simple ruler, which can draw squares Please note: There is a slight color difference or discrepancy in kind, please don't mind, thank you! Material: Stainless steel colour: Silver Package Contents: 2 x Drill Gauges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.