This product is a kind of easy-to-process ceramics and can be processed with ordinary carbide and diamond tools for various precision processing. Since semiconductor and liquid crystal manufacturing parts and inspection jigs are used in a small amount and a variety of products and the delivery time from design to prototype production needs to be shortened, the machinable ceramics can utilize precision machining and fasten delivery. It has been widely used in the manufacturing process of semiconductors and FPDs that require high purity, high hardness and high precision.