What are the round metal washer-like separators on glass tables called? Where can I buy them?

Tire shop

3428 Pelham Pkwy, Pelham, AL 35124, USA

Laundromat

3018 Pelham Pkwy #109, Pelham, AL 35124, USA

Coffee shop

480 Cahaba Valley Rd A, Pelham, AL 35124, USA

Thrift store

3592 Pelham Pkwy, Pelham, AL 35124, USA

Department store

2181 Pelham Pkwy, Pelham, AL 35124, USA

Hardware store

3010 Pelham Pkwy, Pelham, AL 35124, USA

Supermarket

200 Big Mountain Rd, Pelham, AL 35124, USA

Countertop store

1350 McCain Pkwy, Pelham, AL 35124, USA