3M Green Corps Roloc Disc 36534, 40 grit, 3 in, 25 Discs/Carton, 10 Cartons/Case The 3M Roloc Green Corps Abrasive Disc is a coarse grinding disc for removing paint, rust and welds in collision repair. Its small diameter makes it especially useful in hard-to-reach areas. Convenient Roloc attachment securely locks the disc in place with a simple twist, and allows for disc removal just as easily. And the grades are color coded for fast, accurate identification.