Dr Schutz heavy duty Footfixx swivel chair glides have soft carpeted base with wood or metal chair leg attachment. Metal leg attachment inserts into hollow chair leg; Wood leg attachment screws into the base of the chair legs. All Dr Schutz Scratchnomore carpeted furniture floor protectors are commercial heavy duty quality and each style, including Footfix has replacement pads available. Replacement pad includes the swivel housing, attachment mechanism stays securely in place on chair. These commercial quality chair leg floor protectors are for use on home or business chairs. Multiple sizes available for wood or hollow metal chair legs.