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 with a square base, making them easy to install and secure into tubular legs. The black finish ensures the glides blend well with any style of furniture. The insertion glides have a 3/4" (19 mm) base and an 11/16" (17 mm) interior diameter. The package contains 4 furniture glides.