Standard Pack = 1 piece(s). Buff & Blend Cross Buffs - 2 Ply Aluminum OxideRemoving surface oxidation and rustSurface preparation prior to coatingRemove surface coatings for part inspectionCorrosion removal on Steel Rule and Kirksite diesMold and die polishingPolishing valve spools, and round and Square tubingPolish inside Diameters of lifter bores, valve bodies and brake cylinders