Petzl OK Screw-Lock
Here's what other sites are saying:
The symmetric shape of the Petzl OK Oval Screwgate locking carabiner makes it especially useful when rigging hauling systems.
Many pulleys require an oval-shaped carabiner to work properly. The OK carabiner is designed for just that. It's also very useful as a general purpose carabiner at belays.-- Symmetric shape is ideal for use with belay devices and pulleys to maximize efficiency no matter which end is closest to the device-- Oval shape works great with pulleys-- Keylock system-- Red lock indicator offers visual confirmation that screw lock is securely closed-- Made in Italy
For use with pulleys and hauling systems, the symmetric OK manual screw-lock carabiner is easy to use with one hand.
You're the kind of climber who loves a classic shape and feel, but you're also a gearhead who loves new technology - stock your rack with Petzl's OK Screwlock Carabiners, and you'll satisfy both sides of your brain. The classic oval shape stays in place while the screwgate ensures that you'll stay safe on the big wall.
- Mountain Gear