Fiber oilstone (commonly known as the super thin stone) combine a high purity ceramic fiber with thermoplastic resin, with high hardness, wear resistance and not easy to break. Except for the hand-held grinding, and is suitable for application of pneumatic, electric reciprocating grinding machine. It is the most perfect used in the ultrasonic vibration machine. Ceramic fiber oilstone can grind the mold with a variety of different materials. The most suitable for general difficult grinding processing, such as narrow trench wall, ditch, hole, scratch, ribs and micro-fine. Especially for quick removal hardening surface of mold after EDM. Grinding can use water or oil as grinding agent. Grit size: P150,P180,P220,P320,P400,P600,P800,P1000,P1200 ( 1 piece each, 9 pieces in total ) Suggestion: 220 , 320 for removing hardening surface of mold after electric discharge machining and mechanical rough cut. 400 , 00 for removing the fine machining marks and general grinding. 800 , 1000 , 1200 , 1500 used for fine grinding or polishing before the mirror processing. color: random colors, don't accept the specified color Material:Alumina Fiber Whetstone Size:100 * 4 * 1mm Package Contents: 9 * fiber whetstone 1 * clamp Only the above package content, other products are not included. Note: Light shooting 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.