A line striper comprising: a frame ; a mounting arm extending from the frame; a clamp mountable on the mounting arm; a vertical bar attached to and extending from the clamp; an extension bar attached to and extending from the vertical bar; and a spray gun attachable to the extension bar; characterised in that the clamp includes a body that is G shaped and comprises: a first leg ; a second leg extending away from a first end of the first leg , having a first end that is connected to the first end of the first leg and a second end distal from the first end of the second leg, and forming a corner with the first leg; a third leg extending away from a second end of the first leg and having a first end that is connected to the second end of the first leg and a second end distal from the second end of the first leg: an opening through which the mounting arm is configured to extend formed by the first leg, second leg, and third leg; a fastener which is extendable from the third leg towards the corner and configured to secure the mounting arm within the opening; and a lip extending into the opening from the second end of the second leg of the body ; wherein the opening is adapted to allow the clamp to be mounted on the mounting arm without sliding the clamp along the mounting arm, and wherein the clamp is adapted to hang from the mounting arm without the fastener being engaged with the mounting arm. a frame ; a mounting arm extending from the frame; a clamp mountable on the mounting arm; a vertical bar attached to and extending from the clamp; an extension bar attached to and extending from the vertical bar; and a spray gun attachable to the extension bar; characterised in that the clamp includes a body that is G shaped and comprises: a first leg ; a second leg extending away from a first end of the first leg , having a first end that is connected to the first end of the first leg and a second end distal from the first end of the second leg, and forming a corner with the first leg; a third leg extending away from a second end of the first leg and having a first end that is connected to the second end of the first leg and a second end distal from the second end of the first leg: an opening through which the mounting arm is configured to extend formed by the first leg, second leg, and third leg; a first leg ; a second leg extending away from a first end of the first leg , having a first end that is connected to the first end of the first leg and a second end distal from the first end of the second leg, and forming a corner with the first leg; a third leg extending away from a second end of the first leg and having a first end that is connected to the second end of the first leg and a second end distal from the second end of the first leg: an opening through which the mounting arm is configured to extend formed by the first leg, second leg, and third leg; a fastener which is extendable from the third leg towards the corner and configured to secure the mounting arm within the opening; and a lip extending into the opening from the second end of the second leg of the body ; wherein the opening is adapted to allow the clamp to be mounted on the mounting arm without sliding the clamp along the mounting arm, and wherein the clamp is adapted to hang from the mounting arm without the fastener being engaged with the mounting arm. <EOS>