● Precision Vise of Stainless Steel for EDM, the material is stainless steel, have done vacuum harden treatment and deeply cold treatment before doing the grinding process, the essence is not easy to deformed. ■ Feature: ● Parallelism:Within ±0.002mm ● Squareness:Within ±0.002mm ● Material:Stainless Steel ● Harden:HRC45°~55° ● Weight:4.5kg