40 x 40 150mm long 
                   space for the chain when bolted down is 32mm by 34mm 
                    Come 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