MATERIAL: Black Nylon construction & chromed metal stem FORM & FUNCTION: Ideal for American plastic drawer units, American plastic wide drawers units, American plastic storage units, office chairs, American drawer carts etc. The metal stems can rotate 360 degrees for easy movement. ASSEMBLE: Easy to Install. Pop in Play - Just push into plastic storage unit MEASUREMENT: 2" in overall height (with Metal Stem). 1" in overall width. 1.375" overall depth (front to back). Restore the mobility of a plastic drawer, plastic storage cart or office chair with these NUMEBRNYC Plastic Caster Wheels. They feature a nylon construction with chromed metal stems, designed to provide a smooth movement over carpeting. These plastic cart caster wheels have a simple push-on design for easy installation. They also rotate 360-degrees for smooth movement and can be used for a variety of furniture pieces. They're available in a Set of 4 - 1 1/2" Wheels with Stem (Please see images for full size description). NUMBERNYC Casters come in black to match most office furnitures, units. Our Stem Wheels fit most Storage Containers - Plastic Drawers, Storage Containers or Drawer Plastic Bins & Wide Storage Containers. Etc. *NUMBERNYC Wheels do NOT come with Adapter Plugs. If you receive Plugs in your order, you did NOT buy NUMBERNYC