corresponding to the tooth pattern face 24 is provided with a tooth pattern face as well the tension provided by spring sheet 3 is such that the tooth pattern face 24 of the movable jaw 2 and the tooth pattern face 111 of the fixed jaw 11 is such that the jaws 2 and 11 are closed together in order to separate the tooth pattern face 24 of the movable jaw 2 from the tooth pattern face 111 of the fixed jaw 11 the user will depress the press handle 22 downwardly as a result movable jaw 2 pivots about fixing pin 12 such that at least one end of the tooth pattern face 24 moves and swings at least a certain distance in a direction opposite to the depressing force applied to press handle 22 thus tooth pattern face 24 is forced to separate from tooth pattern face 111 of the fixed jaw 11 to thereby form a mouth for receiving a work piece to be clamped the mouth is defined by the thus opened movable jaw 2 and fixed jaw 11 when the workpiece is placed in the thus formed open mouth and the user thereafter releases the pressure applied to the spring sheet 3 the movable jaw 2 automatically closes about the piece to be clamped and worked on in accordance with the size and configuration of the workpiece as is evident two hands are not required to operate the speed wrench of the present invention after finishing the locking and releasing work the.