DIN 7980 Stainless Steel Spring / Lock Washers.  A2 SS is the Equivalent to Type 304.  
These narrower washers are designed to sit totally under the head of DIN 912 Socket Head Cap Screws.
d1 (internal diameter) = 6.1mm 
d2 (external diameter) = 9.9mm 
S (thickness) = 1.6mm  
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