Thin oval object with hole in center on front, and clip-like

Hollow Shaped Oval Shape Hole Shape

Oval Shape Properties, Drawing & Objects - Lesson

Oval hole hi-res stock photography and images - Alamy

Cast metal Y shaped threaded object found among farm equipment from around the 30s. : r/whatisthisthing

What are some things that are shaped like an oval? - Quora

CZ Helix Huggie – Studs

Types of Bolts: Types, Components, and Fastener Terms

Cast iron device with a scope looking piece, free moving wheels and a storage vessel. Estimates best guess age 1910. : r/whatisthisthing

Reuleaux triangle - Wikipedia

Supermassive Black Hole In Milky Way Spinning Rapidly, Taking Shape Of Rugby Ball

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Oval Middle Hole