K8G Sigma Twin Gate Carabiner

A D-shaped auto-locker built for the exact moments where you cannot afford a carabiner to come open.

The Sigma pairs the Twin-Gate system's two opposing closures — one wire gate, one keylock bent gate — into a D-shaped body suited to belays, personal anchor systems, and as the rope-end biner on a quickdraw when a hard pitch with a long runout makes accidental opening a real risk. Like the rest of the Twin-Gate line, it locks the moment both gates close, with no screwing or twisting required, and keeps working cleanly in dust, mud, and ice where a screw-lock sleeve can jam. The keylock nose on the solid gate also resists snagging on slings and webbing during clipping.

Features

• Twin-Gate system: one wire gate, one keylock bent gate, auto-locks on closure
• No screwing or twisting required — locks instantly when both gates close
• Resists jamming from dust, mud, and ice, unlike screw-lock sleeves
• Keylock nose prevents snagging on slings and webbing
• D-shaped body suited to belays, anchors, and high-consequence quickdraw placements
• Individually proof-tested and laser-stamped

Specifications

• Length: 101 mm (4.0 in)
• Width: 62 mm (2.4 in)
• Gate opening: 23 mm (0.91 in)
• Major axis (closed gate): 30 kN
• Minor axis: 9 kN
• Open-gate strength: 9 kN
• Weight: 57 g (2.0 oz)
• Material(s): forged aluminium
• Certification(s): EN 12275 Class B, UIAA 121, EN 362