Berges® Spring Tensioning pulley type F400sb for use with wide belts type CW-b 93 and fixed diameter pulley, speed change achieved by changing center distance between sheaves. Diameter 400mm with length through bore of 300mm, one spring on each side of pulley for a total of two springs. Maximum shaft diameter 65mm with standard bores listed for sale, for alternative bores are available contact TVT for non-standard bore quotation.