Fiber whetstone (commonly known as ultra-fine stone) is a combination of high-purity ceramic fiber and thermoplastic resin, with high hardness, wear resistance and not easy to break. In addition to hand-held grinding, it is suitable for pneumatic and electric reciprocating grinding machines. It is the most perfect ultrasonic vibration machine. Ceramic fiber whetstone can grind molds of many different materials. Most suitable for generally difficult grinding, such as narrow groove walls, grooves, holes, scratches, ribs and micro. Particularly suitable for quick removal of hardened surfaces of molds after . Grinding can use water or oil as an abrasive. Granularity: P220, P320, P400, P600, P800, P1000, P1200 220# and 320# are used to remove the hardened of the mold after and mechanical rough cutting. 400#, 600# are used to remove fine machining marks and general grinding. 800#, 1000#, 1200# are used for fine grinding or polishing before mirror processing. Colour:random color(The specified color is not accepted) Material:Alumina Fiber Whetstone Package Contents: 7 * Fiber Whetstone 1 * bracket Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.