A work device, which includes - a body equipped with an attachment arrangement for arranging the work device at an end of a set of booms of a work machine, - a pair of jaws fitted to the body, which includes two jaws (14, 15) arranged to form a grab, of which the first of the jaws of the pair of jaws forming the said grab is fitted permanently to the body and the second of the said jaws is pivoted rotatably and separately from the attachment arrangement to the body in order to open and close the said grab, - claws (40, 33) fitted to the jaws (15, 14) in which the claws of the moveable jaw are arranged to intermesh with the claws of the fixed jaw for bringing the movable jaw out of way of the fixed jaw, - a hydraulic actuator attached by one end (17.1) to the body of the work device and equipped with a moving operating element, which is arranged to act on the moveable jaw in order to open and close the grab, - a wide-angle pivot setup arranged to the work device between the moving operating element of the hydraulic actuator and the moveable jaw in order to open and close the grab by using only the movable jaw, which wide-angle pivot setup is arranged to include - an arm mechanism equipped with two pivots (20, 21) fitted on a jaw arm, by which is arranged to rotate the moveable jaw by a linear movement of the moving operating element of the hydraulic actuator, - a rotatable lever arm arranged between the jaw arm and a pivoting arranged for that to the body to convert the movement of the moveable operating element of the hydraulic actuator into a rotational movement of the moveable jaw, and by which a rotation angle of the movement created for the moveable jaw by the said wide-angle pivot setup has a magnitude of more than 120°. - a body equipped with an attachment arrangement for arranging the work device at an end of a set of booms of a work machine, - a pair of jaws fitted to the body, which includes two jaws (14, 15) arranged to form a grab, of which the first of the jaws of the pair of jaws forming the said grab is fitted permanently to the body and the second of the said jaws is pivoted rotatably and separately from the attachment arrangement to the body in order to open and close the said grab, - claws (40, 33) fitted to the jaws (15, 14) in which the claws of the moveable jaw are arranged to intermesh with the claws of the fixed jaw for bringing the movable jaw out of way of the fixed jaw, - a hydraulic actuator attached by one end (17.1) to the body of the work device and equipped with a moving operating element, which is arranged to act on the moveable jaw in order to open and close the grab, - a wide-angle pivot setup arranged to the work device between the moving operating element of the hydraulic actuator and the moveable jaw in order to open and close the grab by using only the movable jaw, which wide-angle pivot setup is arranged to include - an arm mechanism equipped with two pivots (20, 21) fitted on a jaw arm, by which is arranged to rotate the moveable jaw by a linear movement of the moving operating element of the hydraulic actuator, - a rotatable lever arm arranged between the jaw arm and a pivoting arranged for that to the body to convert the movement of the moveable operating element of the hydraulic actuator into a rotational movement of the moveable jaw, - an arm mechanism equipped with two pivots (20, 21) fitted on a jaw arm, by which is arranged to rotate the moveable jaw by a linear movement of the moving operating element of the hydraulic actuator, - a rotatable lever arm arranged between the jaw arm and a pivoting arranged for that to the body to convert the movement of the moveable operating element of the hydraulic actuator into a rotational movement of the moveable jaw,