DMM Director Auto-Locking Carabiner

The DMM Director carabiner is an auto-locking connector from DMM, the Welsh hardware maker many tree climbers already trust for rings, swivels and biners. It is a solid choice for linking a hitch climber, a rope wrench tether or a lanyard to the saddle bridge.

Where the Director fits in a climbing system

Most climbers carry a handful of auto-locking carabiners and assign each one a job. The Director is the kind of biner you put on the bridge to hold a hitch climber, on the end of a lanyard, or on a rope wrench tether. An auto-locking gate means you do not have to remember to spin a sleeve closed every time you reclip, which matters when you are moving through the canopy all day.

Before you build it into your kit, check that the gate opening and basket fit the hardware it will live on, and that it sits loaded along the spine rather than across the gate. Compare it with other auto-locking carabiners if you need a different shape or gate style.

A good habit is to dedicate the Director to one position in your system and leave it there, so you always know its history. Mixing life-support biners with the ones you use to hang a handsaw or a water bottle makes it hard to track which carabiner took a fall or got dropped on the driveway. Mark it with tape or a color code if your kit has several look-alike biners.

Inspection and safe use

Read the strength ratings stamped on the spine and gate, and make sure they meet the requirement for how you plan to use the biner. Look for grooves worn by rope, sharp edges, cracks, and a gate that sticks, fails to close fully, or does not lock on its own. Retire any carabiner that has taken a hard drop onto a hard surface or shows damage.

Life-support gear must meet the applicable standard, be used per the manufacturer's instructions and ANSI Z133, be inspected before every climb, and be used only by trained climbers.