300 M3 x 10mm/16mm/20mm/25mm/30mm, 12.9 grade alloy steel hexagon socket head bolt and nut kit.

M3 x 10mm/16mm/20mm/25mm/30mmHex Socket Head Cap Bolts Screws Nuts. According with standardized metric system. And the average error is less than 0.01mm. Different sizes can meet your different using.
【MATERIAL】--- Made of high quality 12.9 grade alloy steel, which features is strength and offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance
【PACKAGE】--- All of Bolts and Nuts are packed in a durable and sturdy Box to efficiently bear the weight of the whole package. In order to avoid the bolts being scattered or lost during use, we specially package for each different type of bolts for your convenience and storage. Not only give you the best product, but also the best storage system for them.
【WIDE APPLICATIONS】--- M3 Hex Socket Head Bolts and Nuts Assortment Kit Serves a wide range of use and for professionals, amateurs, landlords, repairmen, other DIY . The set is perfect to replace broken and missing bolts. When you are mad for the missing bolts, it is a perfect friend for you. The kit has lots of different sizes, which can meet the maximum of requirement for you.
【Guarantee】--- If you have any question or suggestion, please feel free to contact us anytime.

【Features:】
1, 12.9 grade alloy steel with superior rust resistant ensure long lasting results，corrosion resistance, anti-aging, good toughness
2, This kit can be widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc.