ISC Offset Oval Quadlock Carabiner with Captive Pin

The ISC offset oval quadlock carabiner pairs a four-stage auto-locking gate with a captive pin that keeps the carabiner from rotating out of position. Climbers use it where a connector should stay put, such as on a device, pulley, or bridge.

What the captive pin and quadlock gate do

A loose carabiner can rotate until it loads across the gate, which is exactly how connectors fail. The captive pin closes off part of the carabiner so whatever is clipped in, such as a pulley, device, or eye, stays in the right spot and the carabiner loads along its spine.

The quadlock gate takes four deliberate actions to open. That is more fiddly with gloves than a triple lock, but it is much harder for a branch, rope, or bridge to roll it open by accident. Compare it with other auto-locking carabiners if you prefer a quicker gate.

Use and inspection

Load the carabiner only along its major axis and check the gate closes and locks fully every time you clip it. Do not let it rest across an edge or a limb, and do not three-way load it unless the maker allows it.

Inspect before each climb for sharp edges, grooves, cracks, and a sticky or slow gate, and retire any carabiner that has been dropped onto a hard surface from height. Treat it as life-support equipment: it must meet ANSI Z133 and the manufacturer's instructions, be inspected before every climb, and be used only by trained climbers.