ratchet type for fine adjustment with double locking protectionlarge saddle, unitized frame construction, ductile iron rackcapacity: 6 tonmin height: 390mmmax height: 605mmsafety standards conform to ansi/asmenet weight :5.8kgdimenstions :270mm x230mminside (from one end to the other ) : 350mmstanding up without the black stem :335mmstanding up with the black stem :380mm