3/8" Black Phosphate Steel Pushnut Bolt Retainers

Diameter: 3/8"
Material: Steel
Finish: Black Phosphate
Shape: Round
Style: Retainer
Type: Push Nut

Box of 30.

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.