nut and bolt swiftly identifies 28 distinct sizes One side features metric thread sizes spanning from *0.7 to M14*2.0 The other side features Imperial(standard) thread sizes ranging from 6-32 Coarse to 1/2-20 Fine Clear scale markings and accurate bolt and nut size Handy and practical, does not take up space Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Thick enough and easy mounting on a wall or workbench Colour:Red Material:Aluminum Alloy Package Contents: 1 x Nut and Bolt 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.