... . Grade 5 is the normal most simple one. Roller guide: GZB(heavy load with roller cage) Size: 35mm, 45mm, 55mm, 65mm, 85mm, ... . Characteristic: Heavy load, low noise, high speed, high accuracy; Normally used for machining center, grinding machinery, heavy machinery etc.SHANDONG TONGYA TRAFFIC SAFETY FACILITIES ... ,NO.Foutteenth tariff-free zone,Qingdao develpment zone,China. High Quality Linear Guide