This convenient kit comes packed in a molded case and includes: 3M(TM) File Belt Sander PN28366, 2 popular 3M(TM) File Belt Sander Attachments Arms PN28368 and PN28370. Both steel and rubber drive wheels. Uses belt sizes 1/8 in - 3/4 in x 18 in - 24 in for a wide variety of metalworking applications.