ขอมูลทั้งหมดนี้ขอขอบคุณ อาจารย์อวยชัย สุภาพจน์ With Any process you select recall these easy: always get started with a coarse abrasive, then use increasingly finer supplies until eventually you arrive at the desired smoothness. Fill barrel ¾ whole with stones and shake to settle. Will not use fewer, it will not likely perform Successfully Submitted (Awaiting Approval)