29 Measuring Holes: 0.062-0.50 Bolt and Wire Diameter Index Gauge, Identified drill bits from 1/16inch to 1/2inch in 1/64th increments, From 1.59mm to 10.32mm, come with clearly marked fractions and decimal for accurate measurement High Quality Material: Made of high-end rustproof stainless steel. Making from single pieces, they are sturdy and durable. They can gauge the drill bits quickly and easily when working with older, unmarked drill bits especially the bits are too small to fit diameter markings. Very slight but practical equipment in your home tools box Excellent Design:Precision machining holes,Etched markings graduations to give high contrast and will not wear off. It is easy to hang which provides convenience for your work with a hanging hole design Package Includes: 1 x Silver and 1 x Black of bolt and wire diameter index gauge which have been clearly imprinted with Black/Silver graduations, creating a vivid contrast, helpful to read measurement of bit sizes quickly and accurately Proper Size: Black: 6.02inch x 3.05inch 0.17lb, Silver: 6.3inch x 2.44inch 0.14lb. Very light weight. You can put it in your bag as simple rulers, while they can draw drill holes, straight lines and rectangle color:Black + silver Material:Stainless steel Package Contents: 2 x drill guide 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.