Berges® Spring tension Pulley with torque control type D210b for use with wide belts type CW-b 37 and adjusting pulley R210b. Diameter of 220 mm with length through bore 135mm, die cast aluminum sheave faces with steel slide hub. Identified by casting numbers x and x, one spring; castings used on other series of pulleys.. Maximum shaft diameter 38mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation.