1. Size: M4-M52, 3/16"-2" 2. Length: 30mm-3000mm 3. Class: 4.8,5.8,8.8,12.8 ... Size: M3-M56, UNC 6#-2", BSW 3/16"-2" length: 1000-3000mm,3-12 feet3) Material: stainless steel, low carbon ... , Black, Zinc Cr+3,Yellow Zin c Cr+6, H.D.G. We not only make fasteners incl bolts/nuts/rods etc.But also ... deal in all of fasteners incl,carbon steel,stainless steel bolts,nuts,rods,washers, ...