"NSN USED TO PURCHASE A MINIMUM OF 8 CONTAINRS TO A MAXIMUM OF 15 CONTAINRS;CERTIFICATION PWA 1302;RC 40-45 HARDNESS;5000 PSI MINIMUM STRENGTH;BEST FINISHED BY WET SANDING;CAST, CRUSHED TUNGSTEN CARBIDE/12% COBALT COMPOSITE POWDER.COATINGS ARE HARD, DENSE AND RESISTANT TO FRETTING TYPE WEAR.BE RESTRICTED TO BELOW 1000 DEG (F)"