Brand New Factory Sealed (2 Pack) *** Inventory 20 Rh-In 2 2 Pack - Adjustable Sliding Patio / Glass Door Tandem Roller, 1-1/4" Diameter Ball Bearing Wheels, Heavy Duty Steel Wheels Housing for Severe Weather Environments Tandem Roller Features: All 3946 rollers meet AAMA 906.3-96 CAWM standards Heavy duty- (2) 3946 tandem rollers support a 500lb. door panel Adjustable mechanism is designed to prevent wheels from losing adjustment 1-1/4? ball bearing wheels for smooth door operation Heavy duty steel wheels housing for severe weather environments Can be used on any door material- Please see line drawing picture for size specifications FPL 3946 Sliding Patio / Glass Door Roller Assembly- Tandem design with 1-1/4? ball bearing wheels, side-adjustable housing. Housing dimensions: length 6-1/4?, thickness 11/16?, height 1-3/16?. All 3946 roller assemblies are designed to meet AAMA 906.3-96 and CAWM standards for corrosion resistance, load, and life cycle specifications.