12mm-1.5 Chrome Plated Steel Fine Thread Flange Nuts (4 pcs.)

Diameter: 12mm
Diameter 2: 20mm
Thickness: 12mm
Material: Steel
Finish: Chrome
Driver Type: #18 Wrench
Thread Size: 1.5mm (Fine)
Style: Non-Serrated
Type: Flange Nut
Specifications: DIN 6923
Diameter 3: 24mm

Box of 4.

A flange nut has a wide flange at one end that acts as an integrated, non-spinning washer. This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface.