SBR 10-4000 WERB | Aluminum Linear Motion Guide RailWERB SBR 10 4000 Supported Linear Round Shaft, 10 mm Diameter, 4000 mm Length The WERB SBR 10 4000 supported linear round shaft is a slim 10 mm diameter SBR rail on an aluminium base, supplied in 4000 mm length. It is suitable for very light duty CNC, DIY automation, and test rigs that need long travel with a compact shaft size. Abdul Traders, as the authorised WERB distributor in Pakistan, stocks SBR 10 4000 rails for users in Lahore, Karachi,