DZUS FASTENERS
https://files.southco.com/static/Literature/D1.en.pdf#Quarter-Turn-Fastener-D1-4-430SE
These versatile, economical quarter turn fasteners for high-volume light-duty applications provide a low installed cost, attractive aesthetics, and more generous tolerance ranges than other quarter turn fasteners. Built-in detents indicate full engagement, while a spring-action feature provides a degree of vibration resistance.
