* executed with needle cages they are offering an extreme high stiffness and regidity.* SpecificationsAnti-friction guideways are made of bearing steel No. 1.3505 or 1.2842, through-hardened 58-62 Hrc.As a special execution they can be made of corrosion resistant steel No. 1.4034, hardness value 54-57 Hrc.Max. length of one piece 1200mm. Longer lengths will e ground together and can be matched.