... /SG2.0sand removal of large sized castings,scale removal of large sized products from forging,stamping,die-forging,drawing and rolling or after ... /SG1.7sand removal of large and medium sized casting,scale removal of forging heat-treated work piece,surface blast cleaning ... SS0.8S230/SS0.6G25/SG1.0G40/SG0.7surface cleaning of small -sized casting,forgings and heat-treated pieces,alumininum and copper ...