An adjustable weight set apparatus comprising: a handle having a first end portion and a second end portion opposite the first end portion; an adjustment assembly; and, a first weight set adapted to be supported on the first end portion of the handle and a second weight set adapted to be supported on the second end portion of the handle, each of the first and second weight sets comprising a plurality of weight plates, each weight plate comprising: a weight plate member having a plate surface; and a centrally disposed hole in the weight plate member configured to receive the handle for retaining the weight plate to the weight set; and the weight set apparatus characterized in that each locking plate comprises a locking mechanism on the weight plate member for securing the weight plate to another weight plate of the set, the locking mechanism comprising a plurality of spaced apart locking elements each being formed by at least one cut in the weight plate member, at least a portion of each locking element being displaced from the plate surface forming a slot behind the locking element, the slot being configured to receive a locking element on said another weight plate of the set to secure the weight plate to said another weight plate, the locking elements being arranged relative to each other and to the centrally disposed hole for securely retaining the weight plate and said another weight plate to each other, the locking elements comprise a first locking element positioned substantially centrally on the weight plate member such that the first locking element includes the centrally disposed hole, and a second locking element disposed below the first locking element. a handle having a first end portion and a second end portion opposite the first end portion; an adjustment assembly; and, a first weight set adapted to be supported on the first end portion of the handle and a second weight set adapted to be supported on the second end portion of the handle, each of the first and second weight sets comprising a plurality of weight plates, each weight plate comprising: a weight plate member having a plate surface; and a centrally disposed hole in the weight plate member configured to receive the handle for retaining the weight plate to the weight set; and the weight set apparatus characterized in that each locking plate comprises a locking mechanism on the weight plate member for securing the weight plate to another weight plate of the set, the locking mechanism comprising a plurality of spaced apart locking elements each being formed by at least one cut in the weight plate member, at least a portion of each locking element being displaced from the plate surface forming a slot behind the locking element, the slot being configured to receive a locking element on said another weight plate of the set to secure the weight plate to said another weight plate, the locking elements being arranged relative to each other and to the centrally disposed hole for securely retaining the weight plate and said another weight plate to each other, the locking elements comprise a first locking element positioned substantially centrally on the weight plate member such that the first locking element includes the centrally disposed hole, and a second locking element disposed below the first locking element. a weight plate member having a plate surface; and a centrally disposed hole in the weight plate member configured to receive the handle for retaining the weight plate to the weight set; and the weight set apparatus characterized in that each locking plate comprises a locking mechanism on the weight plate member for securing the weight plate to another weight plate of the set, the locking mechanism comprising a plurality of spaced apart locking elements each being formed by at least one cut in the weight plate member, at least a portion of each locking element being displaced from the plate surface forming a slot behind the locking element, the slot being configured to receive a locking element on said another weight plate of the set to secure the weight plate to said another weight plate, the locking elements being arranged relative to each other and to the centrally disposed hole for securely retaining the weight plate and said another weight plate to each other, the locking elements comprise a first locking element positioned substantially centrally on the weight plate member such that the first locking element includes the centrally disposed hole, and a second locking element disposed below the first locking element.