"NSN USED TO PURCHASE A MINIMUM OF 1 CONTAINER TO A MAXIMUM OF 2 CONTAINERS;CERTIFICATION PWA 1347,AVCO M 3956C,GE B50TF119 AND RR 9507/14;RB 85-92 HARDNESS;3000 PSI MINIMUM STRENGTH FOR SMOOTH SURFACES AND 5000 PSI MINIMUM STRENGTH FOR ROUGHENED SURFACES;MACHINES/GRINDS READILY WITH ALL GRADES OF CUTTING TOOLS"