This wavy parallel set has size of 1/2" - 1-1/2" in 1/8" step and height and parallelism of +/- 0.0002". The thin and fragile workpieces can be secured without damage by utilizing the spring pressure of these parallels, made of high quality spring steel, hardened, stress relieved spring steel and precision ground. It is for use on precision clamping of parts in drilling, boring, milling, grinding and assembly work, etc. and comes with a case.