Its thread screw metric micrometer with inserts.Measuring range: 25-50 mm (1-2").Graduation: 0,01 mm Measured thread pitch: 0,7-5 mm Accuracy (Thread pitch less then 1,75 mm) - 0,010 mmAccuracy (Thread pitch 2-2,5 mm) - 0,013 mmAccuracy (Thread pitch 3-4 mm) - 0,015 mmStandard: GOST 4380-93 (Its easy to find in google).par of Inserts (for thread pitch):0,7-0,8 mm - 1 set1-1,25 mm - 1 set1,5-1,75 mm - 1 set2-2,5 mm - 1 set3 mm - 1 set3,5 mm - 1 set4 mm - 1 set4,5 mm - 1 set5 mm - 1 setIf you have any questions about this product, please tell me, I will give all the necessary information and if necessary, make the video from my Workshop and put it on Youtube for you.If you need more other tools, tell me, I will do my best to find the tools you need, and will set it for you at eCRATER.ABOUT FEEDBACK:Please, leave your Feedback on the receipt of the goods. For me it is very important to have feedback from my customers. If you have any questions about an item, PLEASE CONTACT with me, I always try to achieve the satisfaction of my clients so that You would like to deal with me in the future.NOTE ABOUT DELIVERY TIMEI try to send the goods you paid during the business - day. Delivery time depends on the carrier
