Slide-Co 161515 Bi-Fold Closet Door Top Guide Wheel, 7/8 in., Plastic, Used by Acme, Stanley, Kenna Frame & Others, Pack of 2 This top guide wheel is used to replace damaged or missing guide wheels on bi-folding closet door systems The wheel has an outside diameter of 7/8 in. and measures 1/4 in. in height. The base is 1 in. tall with a 3/8 in. outside diameter Spring-loaded action ensures constant alignment within bi-fold track Constructed of plastic and steel components