From your specs, it looks like a washer with a smaller than usual hole. If you need them in large quantities then probably stamp them out. In small quantities

From your specs, it looks like a washer with a smaller than usual hole. If you need them in large quantities then probably stamp them out. In small quantities, then drill the holes in a plate and then cut out with a saw. If you pivot the rough cut plate around the drilled out hole, then you could set up a jig and use a bandsaw.