Berges® Spring tension Pulley with torque control type D280b for use with wide belts type CW-b 55 and adjusting pulley R280b. Diameter of 296mm with length through bore 182mm, 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 diameter42mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation.