Nut and Bolt Gauge: the package comes with 3 pieces bolt thread gauges, Made from plastic, these gauges offer a smooth that's easy to clean and to oil and grease, ensuring long-lasting use; The compact size makes it easy to fit anywhere, rendering them extremely portable. Versatile Measurement Tool: these tools work for size measurement of bolts from 4 to 1 inch in length and up to 7 inches of fractional bolts; They are equally effective in measuring metric bolt and screw sizes ranging from 3mm to 22mm; The bolt and nut sizer becomes a nice aide for factory or household tasks. Our bolt thread gauge, a high precision tool is carefully made from plastic; It's robust, with stable performance, and high resistance to scratches and wear thanks to the high-temperature forging process; And the bright color (red/blue/white) stand out on your workshop or garage, and help you to faster. Practical Tool for Toolbox: this bolt and nut identifier gauge has holes for measuring bolts and it allows you to easily check the size of bolts and nuts before purchasing replacements; Every gauge is adjustable and can quickly rotate on the cable for quick and easy thread identification; It's a nice addition to your toolbox. Easy and Accurate Measurement: the bolt gauge allows for quick and precise measurement of nuts, bolts, screws, and washers; Equipped with a scale marked in inches and millimeters, this device is extremely user-friendly and favors easy identification. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:As Shown Material:Plastic Package Contents: 3 * bolt thread 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.