Great lightweight keylock nose'd screwgate. Handy for increased security on questionable clips, lightweight enough to carry a couple of them. I use this biner to attach my grigri to my harness with, as the low-profile cross section reduces the grigri's tendency to cross-load the belay biner.

Not for children or beginners, only pinners.

THE hammer to have... since A5 bit the dust, anyway.

Light enough to carry up 3,000' of vertical stone, heavy enough to funk the most stubborn placements. The "beak" side works well for narrow clearances and the reinforced handle/head interface assures years of solid head attachment. The wooden handle makes one of the best shock-absorbers for this type of application, much better IMHO than fully-cast hammers offered by other companies.
If that's not enough for you, BD has a warranty office that stands behind their product. Solid.