Berges® Spring Tensioning pulley type F150sb for use with wide belts type CW-b 28 and fixed diameter pulley, speed change achieved by changing center distance between sheaves. Diameter 159mm with length through bore 115mm, one spring on each side of pulley for a total of two springs. Identified by casting numbers 110000314 and 11000314; casings used on other series of pulleys. Maximum shaft diameter 28mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation