Profile: Kirmell Ltd. provides presswork to a range of industrial sectors. Presswork types include stainless steel presswork, mild steel presswork and also aluminium presswork as well as many other materials. Our heavy duty roof rack ladder clamps are manufactured from heavy duty steel and zinc plated to give durability and long life and designed to withstand the worst of weather conditions. It is designed to be big enough to secure 2 pairs of 3 section ladders, which should fit all ladders and bars. Supplied with all fitting instructions, these are easily assembled with no drilling required.