we can produce all kinds of high quality fasteners such as bolts,nuts,screws,and other off standard fasteners,which are according to GB,ANSI,DIN,UNI,JIS and ISO standards,the products are widely used at bicycle,household appliances,furnitures,automobiles,electro motor and railway systerm. DIameter M3-M56(4"-2")LENGTH 9-900mm(3/8"--36"),property: CLASS: BOLT4.8/6.8/8.8/10.9/12.9,nut:4/8/10/12