Metric Bolt Assortment (Black), 244 Pcs.M3 M4 M5 M6 M8 M10 Heavy Duty Bolts And 1.?HIGH QUALITY TO BE TRUSTWORTHY?Screws assortment have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using. 2.?MANY SPECIFICATION TO BE CHOSEN?: M3x20mm,M4x20mm,M5x20mm,M6x20mm,M6x30mm,M6x40mm,M6x60mm,M8x20mm, M8x25mm, M8x40mm, M8x60mm, M10x40mm, M10x60mm total 244 pieces, Includes 13 Most Common Sizes. 3.?STANDARD SIZE?: Uniform force, located in the center of the head with no offset, not easy to slip; Uniform pitch, obvious screw thread, no residual burrs, the set screw threads will be able to get a good grip. 4.?PLASTIC HEAT SEAL PACKAGING?: Practical and convenient of packing box, All of screws and nuts are packed in a durable and sturdy box, this box can be use for a storage box. 5.?THE WIDE APPLICATIONS?: Door handle, faucet, light fixture, knobs, locks and toys, plumber and other small repairs around the shop, garage or home; and all kinds of precision machinery, classified instruments, electronic products, household appliances, communication products.