Slide-Co 16215 Bi-Fold Door Top Guide Wheel, Sing Loaded,(Pack of 2) Wardrobe door top guide & roller Spring loaded 1/4 inch x 7/8 inch nylon wheel Top mount and Fits 7/16 inch hole Fits 7/16 inch hole Sing loaded steel base Top mounted Self-adjusting for smooth guidance of lead door 7/8in. O.D. nylon wheel Fits 1in. to 1-3/8in. thick bi-fold doors up to 30 lbs. each