Berges® Spring Tensioning pulley type F350sb for use with wide belts type CW-b 72 and fixed diameter pulley, speed change achieved by changing center distance between sheaves. Diameter 346mm with length through bore of 240mm, one spring on each side of pulley for a total of two springs. Maximum shaft diameter 55mm with standard bores listed for sale, for alternative bores are available contact TVT for non-standard bore quotation.