Dasqua 1/8" X 6" 10 piece premium parallel set with aluminum case. Made of premium alloy steel, hardened, stress-relieved, precision ground, in pairs. Highly perpendicular, parallel, and dimensionally accurate. These parallels are convenient to use and maintain. Easy to use in drilling, milling and assembly work by providing a reliable and accurate position for the workpiece. Height and thickness accuracy is +/-0.0004". Edges are slightly beveled. Superior surface finish is Ra0.4um/16uin with a hardness of HRC56-61 which provides a long service life. Matched pairs are marked with sizes.