Some Powerbrace models have keepers which can be used for a left-hand lockrod or a right-hand lockrod. In these cases, the keeper is symmetrical. A benefit of using symmetrical keepers is inventory reduction. Instead of stocking three or four different keepers, two may suffice. Take a step further, if the same model is used top and bottom, this inventory can be brought down to one keeper (an example is the Powerbrace NH-NH model, where the same keeper is used top, bottom, left and right).