Used for leveling, adjusting, and linking operations, GN 350.5 and GN 350.5-NI with Locknut are available in metric sizes. Zinc-plated, blue-passivated steel GN 350.5 versions and 303 stainless steel GN 350.5-NI versions consist of threaded upper sleeve and tapped lower sleeve. While fine thread allows precise, stepless setting and locking using DIN 1810A hook wrench, spherical washer allows precise installation of 2 non-parallel planes at required gradient up to ~4°.