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SZHKM M3 screws assortment Made of High Quality 304 Stainless Steel.They are known for their reliable rigidity and corrosion resistance. This type of steel is able to withstand drastic weather and temperature changes including placement Including extremely wet areas. These qualities ensure the wear resistance of the M3 bolt and nut assortment made by SZHKM, making them almost indestructible. We provide free relevant wrenches in our m3 screws set. Free Hex wrench size: M3 Hex wrench 2mm x1 perfect match for these screws. Both ends of the wrench can be used. 🚀It is suitable for various precision mechanical instruments, electronic products, household appliances, communication equipment, toys, meters, etc. 🚀Hex Socket Head Cap Screws for small gearmotors and power supplies with pre-threaded frames,worked well to secure stepper motors,bearings. 🚀Sometimes you need a screw that's just a hair longer or shorter than the ones you have,this m3 bolt and nut kit set will be your best choice. 🚀The plastic storage boxes of products can keeps everything organized even when you are not using them. 🚀All these m3 bolt and nut manufactured by SZHKM attach a clean map to help ensure that you know exactly which screw you're grabbing. Package Inclusion Total----------------------500pcs M3 screws*6mm-------50pcs M3 screws*8mm----- 30pcs M3 screws*10mm----- 30pcs M3 screws*12mm----- 30pcs M3 screws*16mm----- 30pcs M3 screws*20mm----- 30pcs M3 Nuts--------100pcs M3 Flat Washers--------100pcs M3 Spring Lock Washers--------100pcs Tips: The product contains small parts, please do not let children under 5 years old play, so as not to eat.