These glides go under each corner of the chair to basically keep the upholstery and wood frame of the chair off the floor.  There are have been several styles and sizes of glides used in chair production. Our #6270 has a stem that is has 1/4 X 20 threads, our #6272 has 5/16 X 18 threads, and this part #8272 has 3/8 X 16 threads.

My suggestion is to take one of your glides to a local hardware store, Home Depot, Lowe’s, etc and use their hardware guide to find out what size threads you have, and then order the one that matches what you have using our shopping cart.