SBR 25-4000 WERBWERB SBR 25 4000 Supported Linear Round Shaft, 25 mm Diameter, 4000 mm Length The WERB SBR 25 4000 supported linear round shaft is a medium heavy SBR rail with 25 mm diameter shaft on an aluminium base, supplied in 4000 mm length. It is suitable for long travel CNC and automation axes that need good stiffness with moderate load capacity. Abdul Traders, as the authorised WERB distributor in Pakistan, stocks SBR 25 4000 rails for industrial users in