The 3M File Belt Sander Contact Arm Assembly is an efficient way to maintain your sanding and grinding capabilities, without spending on additional sanders. Each contact arm assembly arrives ready to install onto your 3M File Belt Sander.Use 3M File Belt Sander Contact Arm Assembly as smart, efficient way to ensure your 3M File Belt Sander works for a wide range of jobs in collision repair. Assembled, ready-to-install contact arms include rubber contact wheels and can be used to efficiently change the length or the belt width on your file belt sander. The design of the contact arm assembly provides effective reach to accommodate sanding and grinding in hard-to-reach areas. It is great for spot weld removal, deburring, cleaning and finishing. The 3M File Belt Sander Contact Arm Assembly is designed specifically for 3M File Belt Sanders and 3M Cubitron II Abrasive Belts.