A surgical tool assembly for use in electrosurgery includes an elongated sheath movable in a longitudinal direction. The assembly includes a pair of jaws, with each jaw having a plurality of teeth for grasping tissue and a support element supporting the plurality of teeth. The support element is disposed partially within the sheath and extends to a distal end disposed outside of the sheath. The support element includes a first portion extending from the distal end and delineating a first region. The support element further includes a second portion extending from the first portion and delineating a second region. The second portion is curved to engage with the sheath such that the jaws move towards one another as the elongated sheath moves towards the distal end. The teeth extend from the first region into the second region.