There are many oval carabiners with Trilock clasps, but these often drive left-handers to the brink of madness.
Because Skylotec believes in equality they now have carabiners which make it easy for left and right-handers alike to open the gate. This is the Double Series. This is made possible by the innovative Trilock closures, which can be opened in both directions - without compromising safety, of course. The oval version is perfect for use with pulleys.