These chainsaw sharpening stones are crafted from iron and corundum, sturdy and high hardness to use. Chainsaw sharpening stones feature high wear resistance, and most convenient to grind, polish, assure steady and efficient sharpening of the chainsaw. Features -Color:Light Grey -Material:Iron, corundum -Size:4.70X0.60X0.60cm/1.85X0.24X0.24in - These grinding stones are made of iron and corundum material, which is more solid, can be used for a lasting time. - These are different size grinding stones for different use, very practical and professional. - The particles on the chainsaw grinding head are full and evenly distributed to assure steady sharpening of the chainsaw. - Sharpening stones are small in size and light in weight, you can carry and use them wherever you go. - Chainsaw grinding stones are fine and even, with hard texture, sturdy, with fine grinding polishing effect. Package list: 12 x Grinding Stones (4.0/4.8/5.5)