This listing is for New Metric M8-1.25 x 24mm Hex Coupling Nuts - DIN 6334 nuts have a class 6 rating and are Zinc plated CR+3 (fully RoHS Compliant).  These are normal Coarse thread, which is standard for Metric fasteners.

Available Sizes (AF = Across Flats, L = Length): 

M6-1.0 x 10mm (AF) x 18mm (L)

M8-1.25 x 13mm (AF) x 24mm (L)

M10-1.50 x 17mm (AF) x 30mm (L)