Fiber whetstone (commonly known as ultra-fine stone) is made from a combination of high-purity ceramic fiber and thermoplastic resin, offering high hardness, wear resistance, and durability. Suitable for handheld grinding as well as pneumatic and electric reciprocating grinding machines. Ideal for precision grinding on various materials, especially in hard-to-reach areas such as narrow groove walls, grooves, holes, scratches, ribs, and small surfaces. Particularly effective for removing hardened surface layers. Can be used with water or oil as a lubricant during grinding. Available grits: P220, P320, P400, P600, P800, P1000, P1200 - 220# and 320#: For removing hardened surfaces and rough machining marks - 400# and 600#: For eliminating fine machining marks and general grinding - 800#, 1000#, 1200#: For fine grinding or polishing prior to mirror finishing Color: Random color (specific color requests cannot be accommodated) Material: Alumina Fiber Whetstone Package Contents: 7 x Fiber Whetstone 1 x Bracket Note: The package includes only the items listed above. Other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3 cm.