Per website review:
"DMM gave their Boa Carabiner an ultra-large basket to allow easy belaying even with a clove hitch, and its three gate options give you the choice to use what you like best. The Boa Carabiner comes with either a standard screw gate, Quicklock gate (half twist), and Locksafe gate (pull, then half twist) to fit the bill for every preference. DMM used a large diameter tube to allow smooth, effortless belaying and rappelling, so you can save your energy for climbing.
Belay easier thanks to the DMM Boa Carabiner's large basket and wide tube."
Features Technical Features:
Major Axis Strength: 28kN (6295lbf)
Minor Axis Strength: 12kN (2698lbf)
Open Gate Strength: 10kN (2248lbf)
Gate Type: Screw, Quicklock, Locksafe
Recommended Use: Rock climbing
Weight: 3.7oz (104g)
Personal ExperieinceThis has been my primary Belay Device attachment Locker going nine years now. The DMM quality Twistlock mechanism is smooth, consistently accurate for security and affords easy one handed access, even with gloves on. And the immense 36mm opening affords quick and secure rope access. I love it and will not use any other twistlock biner until something better comes along. Get one... you will not regret it.