(2) M12-1.25 Fine Thread Flange Nuts M12x1.25 with 17mm Hex 12mm x 1.25 Nut

SERRATED FLANGE LOCK HEX NUT CLASS 10. Wrench Size: 17mm. Flange Nut Specs Thread: 1.25 (Fine Thread). Nut Thickness: 11.25mm. NOT previously rejected for quality issues or rescued from a scrap yard.

eBay