These Madico furniture insertion glides are a great choice for protecting flooring surfaces from damages caused by furniture and appliance legs. The plastic glides are round and straight, making them easy to install and secure into round, tubular legs. The black finish ensures the glides blend well with any style of furniture. The insertion glides have a 1" (25 mm) base diameter and a 13/16" (21 mm) interior diameter. The package contains 4 furniture glides.