Efficient and Economical These CRL Heavy Duty Ball Bearing Wheel Assemblies are used with D610, D615, LK610 and MC610 H-Bar. For sliding glass panels fabricated with up to 15 square feet of 1/4 inch (6 millimeter) plate glass, lucite or other glazing material. Housing Height: 1/2 in (12.7 mm) Wheel Width: 3/16 in (4.8 mm) Housing Width: 5/16 in (7.9 mm) Minimum Order: 1 Each