The Bolt Size and Thread Gauge has universal standard and metric thread sizes, identifying hardware from #6 to 3/4inch and 4mm to 16mm. Each size has a nut and bolt checker on the same gauge. Drill Gauge: This nut and bolt has 8 different size holes, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 1/4inch, 1/2inch, which can Helps you quickly and accurately determine screw size, recommending drill bits or tap sizes required for screws. HIGH QUALITY: Bolt and nut identifier gauges are made from CNC machined aluminum alloy and 12.9 grade hardness tool steel threads, with an anodized making them stable and . The scale lines are laser printed for easy-to-read bright white markings over a black design. LENGTH MEASUREMENT: This screw size and thread gauge features 4-1/4 inch and 11 cm rulers to help quickly identify the length of bolts, screws, nuts and washers. EASY TO USE: The Bolt Identification Plate is an accurate and easy-to-use nut and bolt thread verifier with external dimensions of 20.8 inches x 4.3 inches, it includes four rubber foot cups on the top and bottom, two preset foot cups. Drilled holes in the top allow you to place it on your workbench or mount it .<br><br>Colour:black Material:Aluminum alloy<br><br>Package Contents: 1 x 34 Nut and Bolt <br><br>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.