Grivel Omega Screwgate HMS
Here's what other sites are saying:
Use the Grivel Omega HMS Screwlock locking carabiner when you're belaying or building an anchor on a multi-pitch climb. Made from 7000-series aluminum for a good balance of light weight, strength and durability. Large gate open clearance makes it easy to clip anchors or a climbing harness. Screwgate locking method makes this 'biner extremely versatile and easy to use in all conditions. Key lock nose won't snag on pro, ropes or slings, making the 'biner simple to clip. Each Grivel Omega HMS Screwlock locking carabiner is individually strength tested and has a test number laser etched on it.