双面油石 meaning in English

combination sharpening stone

Abrasive sticks stone are suitable for hand sharpening , super finishing and other purpose , including different shapes and uses stones such as double - layered combination stones , sharpening stones for gum cutters , sticks for honing automobile or airplane engines , super finishing stones for bearing races , special stones , etc
油石可用于手工研磨?磨气缸精磨轴承等，包括多种形状和用途的油石如双面油石，切削橡胶用的研磨油石，汽车或飞机引擎用油石轴承座圈的精磨油石及特种油石等等。