Old-school bull dog clips. With a name like that, we can't help but think there's a story buried there somewhere.
These are heavy-duty durable clips with a capacity of 7/16" (1.12cm). They are made of nickel-plated steel.
1 and 1/8" wide x 1 and 1/4" tall (about 3cm)
Sold as a pack of 2.
Made in China