1/2" Zinc Plated Steel Washer Cap Push Nuts PSHNL-143 (12 pcs.)

Diameter: 1/2"
Material: Steel
Finish: Zinc
Style: Washer Cap
Type: Push Nut

Box of 12.

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.