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The Petzl GRIGRI 2 sets the standard for brake assisted belay devices. The GRIGRI II works with a wide range of ropes from 8.9mm to 11mm ropes.
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Petzl Grigri 2 Anniversary Edition Belay Device - Climb
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Petzl GRIGRI Belay Device - Belay Device With Cam-Assisted Blocking for Sport, Trad, and Top-Rope Climbing - Blue : Sports & Outdoors
Petzl GriGri 2
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Safety in climbing demands the best belay devices – Daily Press