Abstract: A constructional laser including a housing (3) with a light source located inside the housing for emitting a visible laser beam rotatable about a rotational axis, a base plate (11) attached to the housing (3) and provided with an inner thread (25) approximately in a center of the base plate (11), and two handles (12, 13) for lifting and carrying the laser and connected to the base plate (11) with the two handles (12, 13) being spaced from opposite sides of the housing (3) and extending at a right angle from the base plate (11) parallel to a height of the housing (3) toward an upper surface (4) of the housing (3), with the handles (12, 13) having at sides thereof remote from the housing (3), three servo positioners (14, 15, 16), with two of the servo positioners (14, 15) being provided on one handle (12) and with the third, height-adjustable servo positioner (16) being arranged on another handle (13), the three-point arrangement of the servo positioners (14, 15, 16) defining an isosceles triangle, with the con

Abstract: A cartridge for use in an extension tool is arranged to receive one or more foil bags containing a single component or a multi-component mass and is formed of a cylinder (3) defining one or more receiving chambers (13) open at the opposite ends thereof. An axially displaceable piston (5) has opposite end faces (5b, 5c) extending across the cylinder (3) and each end face is symmetrical about its axis. The end faces of the piston can be used alternately for dispensing the mass out of the one or more foil bags.