Size description:
For example: M6 * 30 (thread diameter 6mm, thread length 30mm)
Features: A2 stainless is commonly referred to as 304 or 18/8 because it contains 18% chromium and 8% nickel. A2 is an austenitic stainless steel and is almost non magnetic but will still stick lightly to a magnet due to the cold working process. A2-70 is the most commonly used grade, the 70 represents a tensile strength of 700N/mm2.
There are errors in the data, subject to the actual product, thank you for your understanding.