Prime-Line Products R 7228 Drawer Slide Roller, 1-1/8 in. Outside Diameter, Plastic Wheel, Convex, Ball Bearing (Pack of 2) Used to replace worn or missing rollers on metal drawer slide systems; frequently used on file cabinet drawer tracks 9/32 in. wide x 1-1/8 in. outside diameter x 7/8 in. reach, with 1/4 in. - 20 corse thread White in color Plastic tire with steel ball bearings and fittings