A power tool comprising: a power tool base including a base housing, a drive unit supported by the base housing, and a controller coupled to the drive unit; and a power tool implement selectively coupled to the power tool base, the power tool implement including an implement housing, and a working end coupled to the implement housing each of the power tool base and the power tool implement include a mechanical interface portion; characterised in that: one of the power tool base and the power tool implement includes a first electrical interface portion having a first electrical contact, the first electrical interface portion being rotatable relative to the one of the power tool base and the power tool implement in which the first electrical interface portion is coupled to, and to the respective mechanical interface portion; wherein the other one of the power tool base and the power tool implement includes a second electrical interface portion having a second electrical contact, the second electrical interface portion being fixed relative to the one of the power tool base and the power tool implement in which the second electrical interface portion is coupled to; wherein the controller is electrically coupled to the power tool implement in response to the first electrical contact engaging the second electrical contact; and wherein the power tool base and the power tool implement are rotatable relative to each other to lock with each other when the first electrical contact and the second electrical contact are engaged. a power tool base including a base housing, a drive unit supported by the base housing, and a controller coupled to the drive unit; and a base housing, a drive unit supported by the base housing, and a controller coupled to the drive unit; and a power tool implement selectively coupled to the power tool base, the power tool implement including an implement housing, and a working end coupled to the implement housing each of the power tool base and the power tool implement include a mechanical interface portion; characterised in that: one of the power tool base and the power tool implement includes a first electrical interface portion having a first electrical contact, the first electrical interface portion being rotatable relative to the one of the power tool base and the power tool implement in which the first electrical interface portion is coupled to, and to the respective mechanical interface portion; wherein the other one of the power tool base and the power tool implement includes a second electrical interface portion having a second electrical contact, the second electrical interface portion being fixed relative to the one of the power tool base and the power tool implement in which the second electrical interface portion is coupled to; wherein the controller is electrically coupled to the power tool implement in response to the first electrical contact engaging the second electrical contact; and wherein the power tool base and the power tool implement are rotatable relative to each other to lock with each other when the first electrical contact and the second electrical contact are engaged. an implement housing, and a working end coupled to the implement housing each of the power tool base and the power tool implement include a mechanical interface portion; characterised in that: one of the power tool base and the power tool implement includes a first electrical interface portion having a first electrical contact, the first electrical interface portion being rotatable relative to the one of the power tool base and the power tool implement in which the first electrical interface portion is coupled to, and to the respective mechanical interface portion; wherein the other one of the power tool base and the power tool implement includes a second electrical interface portion having a second electrical contact, the second electrical interface portion being fixed relative to the one of the power tool base and the power tool implement in which the second electrical interface portion is coupled to; wherein the controller is electrically coupled to the power tool implement in response to the first electrical contact engaging the second electrical contact; and wherein the power tool base and the power tool implement are rotatable relative to each other to lock with each other when the first electrical contact and the second electrical contact are engaged. one of the power tool base and the power tool implement includes a first electrical interface portion having a first electrical contact, the first electrical interface portion being rotatable relative to the one of the power tool base and the power tool implement in which the first electrical interface portion is coupled to, and to the respective mechanical interface portion; wherein the other one of the power tool base and the power tool implement includes a second electrical interface portion having a second electrical contact, the second electrical interface portion being fixed relative to the one of the power tool base and the power tool implement in which the second electrical interface portion is coupled to; wherein the controller is electrically coupled to the power tool implement in response to the first electrical contact engaging the second electrical contact; and wherein the power tool base and the power tool implement are rotatable relative to each other to lock with each other when the first electrical contact and the second electrical contact are engaged.