1. Size: M4-M52, 3/16"-2" 2. Length: 30mm-3000mm 3. Class: 4.8, 6.8, 8.8, B7 1) Standard: B7 B8 B8M DIN 975, DIN ... : 1000-3000mm,3-12 feet3) Material: stainless steel, low carbon steel, carbon steel, alloy steel...4) Grade: SUS304 SUS316 SUS201 B85) Surface: Plain ... , Black, Zinc Cr+3,Yellow Zin c Cr+6, H ...