Features inch & meter screw checkers are made of high hardness metal and are durable. It is used to easily and accurately identify both nuts and bolts with a threaded thread. Each size has a male gauge on one end and a female gauge on the other end. The inch size silver is marked with the inch size and includes 23 common sizes. Metric black has metric size markings and includes 21 regular sizes. Everything is connected together with a string and the loop dangles for added convenience. Inch Sizes 6-32, 6-40, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-16-20, 1 / 2-13, 1/2-20, 9/16-12, 9/16-18, 5/8-11, 5/8-18, 3/4-10, 3/4-16, 1-8, 1-12 Metric sizes M3-0.5, M4-0.7, M5-0.8, M 6-1.0 M7-1.0, M8-1.0, M8-1.25, M10-1.0, M10-1.25, M10-1.5, M12-1.25, M12-1.5, M12-1.75, M14-1.5, M16-2.0, M16-2, M16-2, M1.2, M16-2, M16-2.0, M16-2.0, M16-2, M16-2.0, M16-2.2. 0-1.5 M20-2.5, M24-2.0, M24-3.0 Specifications: Material: Metal Color: Silver & Black. Item Size: 50.39 in. (128 cm) / 50.39 oz (888 g) / 31.32 oz (37 x 10 x 3 cm) / 14.5 x 1.18 oz (3 oz (32.18 g). Package Weight: 325 g). 62oz Notch Nut and bolt screw checkers only, other things in the picture are not included. There may be deviations due to manual measurement. There may be slight differences from the picture due to lighting and other reasonPackage Contents: 1 x Screw checker for nuts and bolts.