Petzl AM'D Screw-Lock Carabiner. M34 SL (Gray), M34 SLN (Black). From $12.95. D-shaped carabiner for connecting devices on harnesses. The shape and size of this carabiner makes it great for most uses, from connecting a belay device to your harness or as a connector at the end of a lanyard. The D-shape makes it one of the strongest and lightest locking carabiners Petzl makes.

-D-shape has the highest strength-to-weight ratio of all carabiner designs
-Keylock system
-Perfectly suited for use with belay devices due to its symmetric shape on both ends of the carabiner

CE EN 362 class B, EN 12275 type B

Weight: 2.75 oz (78 gm)
Breaking Strengths:
Major Axis: 28 kN
Minor Axis: 7 kN
Open Gate: 8 kN
Gate Opening: 0.94" (24 mm)