Alera ALE-SW790004. This is a 4-Wheel Caster set, with 2 locking wheels. Wheels have a 3-inch diameter. Designed for 1" steel shelving posts, replacing the height adjusting screw/bolt on the bottom of each post.

Ebay's AI Description:

The Alera 3" Wheel Caster Set is designed for wire shelving and includes four casters, two of which have locking mechanisms. The brand is Alera and the color is black. The product is furniture and is manufactured in China.

Brand new, in factory sealed baggie, as shown in last 2 pictures. Outer box opened for inspection and pictures.

Just over 3 pounds shipping weight. Will be sent either usps or fedex, depending on your location. No charge for local pickup.