... 15mm.Embossed surface and clear rail,idear for keeping doucuments. Item No.SizeDimensionClampCapacityThicknessPackingVolHF287AA4218*310Clear rail file10mm14c240/inner,1440/outer0.152Q310- ... 18A4218*310Clear rail file10mm18c160/inner,960/outer0.152Q310-18A4218* ...