Abstract: A fastening element which is designed for driving-in a constructional component, includes a stem (11) adjoined, at it's opposite sides, by a load application section (13) and a tip (12) facing in the setting direction of the fastening element, and a prestress member (20) having a force-introducing section (21) engaging the stem (11) and/or the tip (12), and a bearing surface (22) remote from the load application section (13) and provided with an elastic layer (17) having an opening (18) a wall (19) of which is radially spaced from an axial projection of the stem (11).

Abstract: A fastening element which is designed for driving—in a constructional component, includes a stem (11) adjoined, at it's opposite sides, by a load application section (13) and a tip (12) facing in the setting direction of the fastening element, and a prestress member (20) having a force-introducing section (21) engaging the stem (11) and/or the tip (12), and a bearing surface (22) remote from the load application section (13) and provided with an elastic layer (17) having an opening (18) a wall (19) of which is radially spaced from an axial projection of the stem (11).

Abstract: A controllable planetary gear for transmitting a rotational movement between an input (2) and an output (3), including a ring gear (4) with which a speed range of the transmitted rotational movement is controlled; and a control device (6, 61) having an inner member (5, 51) in which the ring gear (4) is integrated, an outer member (7, 71) supportable in the tool housing (3) without a possibility of rotation relative thereto, and a sensor (8, 81) for measuring a force acting on the outer member (7, 71) and a tension developed in the outer member (7, 71).