12mm x 22mm Zinc Plated Steel Push Nut Bolt Retainers (8 pcs.)

Diameter: 12mm
Diameter 2: 22mm
Thickness: 2.8mm
Material: Steel
Finish: Zinc
Type: Push Nut

Box of 8.

Instead of threads a push nut uses flanges facing inward acting as teeth to hold it in place. It can be pushed or lightly tapped into place and requires cutting to remove.