The carbon brush is compatible with 30/60/70/80/90L industrial vacuum cleaners. Made of good quality carbon and metal, sturdy and durable, ideal for replacing your old or worn one. Worn brushes are often the cause of a poorly running motor. Replacing the brushes can repair an intermittent motor and restore a motor's electrical braking. The carbon brush size is 11x6x29mm. Please measure your carbon brushes to match the size before purchasing. Package includes 2 pairs of carbon brushes for industrial cacuum cleaner.