Up for sale is a lot of (10) Metric M6 x 1.0 Serrated Flange Lock Nuts,
made from A2 stainless steel.

Thread Specification: M6 x 1.0
Wrench Size: 10 mm
Flange Diameter: 13.8 mm (0.54")
Nut Height: 5.8 mm (0.23")

Please see photos.
Questions welcome. Thanks for looking.