(english) A hardened steel bar or plate that is shaped accordidng to the operation to be performed and the material to be machined. ภาษาไทย ภาษาอังกฤษ Bit, Tool (cutter) 0 0 ภาพประกอบ (english) A hardened steel bar or plate that is shaped accordidng to the operation to be performed and the material to be machined.