At sea gate automation we supply a large range of counter-lever gate systems for domestic and commercial use. Counter lever gates work by installing a rail to the bottom of the gate by welding or bolting, the gate should be over 1/3 of your opening longer so it can be supported when the gate is in the closed position,there is two carriages which are bolted down to a concrete base that your gate will slide along freely. If you need more information or need help in designing your gate system please contact us