RS PRO Super Fine Rectangular Sharpening Stone, 102 mm x 19 mm This RS PRO super fine rectangular sharpening stone is useful for when you need to sharpen or re-work your hardened metal tools or components. This product features an Eze-lap® diamond hone made of a stainless steel alloy that's evenly covered with industrial-grade diamond particles. Diamond sharpening stones like this one are known for their excellent and consistent performance and resistance to corrosion and durability, so you can rest assured this product will last a long time. The product is bonded to plastic handles that you can fold to close, creating a safe protective case for the sharpening stone. Keep this diamond sharpening stone handy to quickly sharpen anything with a cutting edge. You can use it with different types of steel. They are known to resist wear and retain their flatness so you can sharpen your tools more efficiently. Features and Benefits - Superfine grade - Dimensions of 102 mm (length) x 19 mm (width) - Rectangular stone shape - Folding stone type - Folding type