Safco Products 5132 Task Master 2" Hard Floor Casters for Task Master, Soft Tough, WorkFit Chairs, sold separately, Black Optional hard floor casters Five 2" hard floor casters, nylon construction For use with Safco Products Task Master 5110, 5113, 5117, 5120 and Soft Tough 6680, 6902, 6912 and WorkFit 6950BL, 6952 and Office Stool Model 5100, sold separately Easy installation