Features: The inch & metric thread checker is made of high hardness metal, durable. It is used to identify both nut and bolts easily, accurately by the thread. Each size has male gauge on one end and female gauge on the other. Silver for inch size, with inch size mark, includes 23 common sizes. Black for metric size, with metric size mark, contains 21 usual sizes. All are stringed together, with hanging loop, very convenient. Inch Size: 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, 7/16-20, 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 Size: M3-0.5, M4-0.7, M5-0.8, M6-1.0, 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, M14-2.0, M16-1.5, M16-2.0, M20-1.5, M20-2.5, M24-2.0, M24-3.0 Specifications: Material: Metal Color: Silver & Black Item Size: 128cm / 50.39in Item Weight: 888g / 31.32oz Package Size: 37103cm / 14.563.931.18in Package Weight: 925g / 32.62oz