PFERD Universal line PSF pipeline depressed centre grinding wheel is designed for for fast stock removal on small construction jobs and for repair work. General purpose pipeline wheel provides smooth grinding action, fast removal rates and good service life with minimal contact pressure. In addition to providing an aggressive, low cost solution for conventional use, INOX-Rated Pipeline PSF is an excellent tool for pipe fitters servicing the Nuclear and food industry. INOX Rated: Free of iron, sulphur and chlorinated fillers; suitable for use on stainless steel. Specification: Diameter (inches): 6; 7/8 Inches Bore Size; Maximum Rotational Speed (RPM): 10200; Thickness (inches): 1/8; Thickness (mm): 4.1.