a jigsaw - type saw blade , typically 6 &# 34 ;× 3 / 8 &# 34 ;× 1 / 8 &# 34 ; stainless steel having teeth angled to saw only in a thrusting direction , is fixed to a handle , typically plastic , that engages the thumb . two jaws of a sliding vise member each slide independently along the saw blade . a first one of the vise &# 39 ; s jaws is biased in separation from the handle by a spring that extends coaxially about the saw blade between the jaw and handle . the remaining , second , jaw presents an external surface contoured to receive two fingers disposed in symmetrical positions on either side of the saw blade . in use for clamping and sawing , a workpiece is inserted between the vise &# 39 ; s jaws and into a first position proximate to the saw blade while the sliding vise member is in a position extended from the handle . the handle and the second jaw are grasped and squeezed between the thumb and a two fingers , thereby simultaneously clamping and sawing the workpiece . the force of the compressed spring allows a reciprocal , return , stroke when the squeezing is relaxed . the workpiece may alternatively be held and sawed in a second position between an exterior rib of the second jaw and a saw table surface . holding and sawing in both positions may transpire entirely by use of but a single hand .