Buy the Dagger Tools DT-SD Combo and get one each of our stainless classic sheet metal shrinking disc to us on steel and aluinium panels, in kit form: (1 ea.) DT-SD1 (9" disc) w/ backing pad, & DT-SD2 (4.5" disc) in one package and save! For metal shaping, sheet metal shrinking, metalworking, metal fab, and auto body repair and restoration. How to use detailed instructions included.