✅【Sizes】M3/M4/M5/M6/M8/M10/M12 internal tooth star lock washers, total 7 sizes 340 pieces in a transparent box, different sizes can meet your different needs. Perfect accessories of shock absorption for machinery equipment. Easy to install and durable to use
✅【Material】High Quality 65Mn metal steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
✅【Function】Internal tooth star lock washers provide spring force, grip sturdy, create more friction and resistance to rotation between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
✅【Wide Applications】Widely used in machinery equipment, industrial production of shock absorption, can meet your different needs in daily life. 
✅【Package】360 pieces 7 sizes in total, packed in a durable transparent box. It is easy to distinguish the size of the product, when you want to use a certain internal tooth star lock washer, you don't have to waste time buying it separately, you can choose the suitable one to meet all your needs.

Tips:
1) Due to different lighting and screen settings, the item's color may be slightly different from the picture.
2) Due to different manual measurement methods, please allow a small size difference.