Up for sale is a lot of (50) Metric M10 x 1.5 Serrated Flange Lock Nuts,
made from A2 stainless steel.

Thread Specification: M10 x 1.5
Wrench Size: 15 mm
Flange Diameter: 20 mm (0.78")
Nut Height: 9.75 mm (0.38")

Please see photos.
Questions welcome. Thanks for looking.