50 x 50 150mm long
                 space for the chain when bolted down is 42mm by 44mm
                            Come's With M10 X 95MM Through Bolts 
                      And Shear Nuts The nuts are designed to shear off 
                                  when a certain torque is achieved 
                                       leaving only the conical part, 
                                making it almost impossible to remove
                                and thus deterring vandals and thieves