Product SpecificationOperating systemAdjustable hi-lo by crank, adjustable back raise with cylinder gas control.(CB-7012 DST, CB-7011 DST) Adjustable back raise by crank (CB-7003 DST).AccesoriesSide Rail (CSR-001, CSR-002, CSR-003), Folding side Rail (FSR-001)Lock SystemDouble Lock S..