'JPT' Brand Of Impregnated Dressers are mainly for fine grinding, i. e. on the screw thread, gear thread, gear teeth & profile grinding machines. ball grinding plant, Tool grinder and plane grinding machines Because of grit impregnated dresser the effective roughness of the wheel is restored. These tools used without maintenance. The dressing of acute angled wheel profile presets no problems. It is more economical because of their low initial cost and their resistance to shock and impact which prevents shattering.