The Grainger Approved Furniture Glides Screw-In are screw-in furniture glides made of durable plastic with felt pads on the bottom. They feature a low profile rounded top and are designed to protect floors. The glides have a 1/2" diameter threaded stem and come in a pack of 4. They can support up to 50 lbs per glide and are recommended for furniture, chairs, and other household items. The felt pads prevent scratches and provide smooth, quiet movement.