Owfeel Pack of 100pcs M310MM Round Head Hex Socket Screws Stainless Steel Bolts Thread length: 10mm/0.39 inch. Made from stainless Steel 304. Suitable for machinery and industrial fasteners. Owfeel is registered trademarks,has been filed in the Amazon,and only authorized this exclusive shop to sell,if find out follow-sell or counterfeit,it is infringement,we will pursue legal responsibility.