What you get: 20 pieces of mini plastic vernier calipers, enough quantity for your use, there are 5 different colors, such as black, gray, blue, white and green : the mini sliding caliper is mainly made of plastic and the inner is inlaid with metal bar, which ensures it's not easy to break, enough for lasting a long time use Applicable occasions: this measurement tool for measuring diameter, can be applied to button, jewelry, round and small items, would not scratch the tested items, and easy to carry Convenient to use: double scale design allow you to get the measuring data accurately and clearly, you can use the 6 inch caliper to measure depth, width and length easily Dimension: the mini double scale size is . 21cm in length, measurement range is 0-5.9inch(150mm), which can meet your needs colour: as shown Material: Plastic Package Contents: 20 x Double scale plastic calipers 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.