* The grain size is 7-5 micron * The weight of one piece is 45-50 grams * Should be used to polish hard metals and alloys – stainless steel, hard alloys, and cast iron The green-gray polishing compound P2 is used to polish hard metals and alloys – stainless steel, hard alloys, and cast iron. It works well for polishing of stone, glass and other nonmetal. The compound is used for finishing cutting tool parts and other elements that require high precision machining. This sharpening compound is perfect for polishing knife, sharpening knife, razors. The grain size of the M7 green-grey compound is 7-5 micron. The weight of one piece is 45-50 grams.