Abstract: A portable electric power tool constituted by two cooperating main components, namely, a power head of predetermined exterior cross-sectional shape and a sleeve with interior surfaces mating to the power head to afford relative sliding movement, but not relative rotational movement of the two. The power head includes a driven shaft adapted by a chuck or the like to receive and hold any of a variety of cutters or the like. The foot of the sleeve is adapted for sliding translation along, or positioning on, a workpiece surface. The angle of the sleeve body relative to the foot is adjustable. By locking the sleeve at any desired angle to the foot, the angle of penetration or engagement between a driven cutter and a workpiece may be accurately pre-established.