Bell Mouth
แปลว่า(english) The flaring or tapering of a machined hole, usually made at the entrance end because of misalignment or spring of the cutting tool.
หรือคุณกำลังค้นหา bell-mouth tube, Bell Mouth, mouth, smooth-running, dead smooth file, Blister Steel, Brite, dead-smooth file, smooth flooring, Burnishing