Its Lot of 7 (N1..N8 without #3) M1 20 deg PA #1,2,4,5,6,7,8 Involute Gear Cutters HSSManufacturing USSR, NEW, stock keepingTooth profile - InvoluteModule 1Pressure Angle - 20 degreeBore dia - 19 mmOut dia - 50 mmMaterial - HSSStandard - GOST10996-64 (You can free find in Google)Recommended cutter parameters of milling:Cutting speed: 30 m/minF - 150 mm/minT - 2,25 mSelection of cutter numbers on the number of gear teethN1 - 12-13 theesN2 - 14-16 theesN4 - 21-25 theesN5 - 26-34 theesN6 - 35-54 theesN7 - 55-134 theesN8 - 135 and tooth rackIf You have more questions, ask me, I find information or make video from my Workshop on Youtube. Normal 0 false false false RU X-NONE X-NONE MicrosoftInternetExplorer4 If you have any questions aboutthis product, please tell me, I will give all the necessary information and ifnecessary, remove the video from my Workshop and put it on Youtube for you.If you need moreother tools, tell me, I will do my best to find the tools you need, and willset it for you at eCRATER. ABOUT FEEDBACK:Please, leave your Feedback onthe receipt of the goods. For me it is very important to have feedback from mycustomers. If you have any questions about an item, PLEASE CONTACT withme, I always try to achieve the satisfaction of my clients so that You wouldhave 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.