Petzl William Triact-Lock
The William Triact is the twist-lock version of the William series. These are HMS carabiners, designed to take a Munter hitch easily (with a name like "William", it is clearly designed for us folks named William ;) ). The locking sleeve is used by lifting then twisting the sleeve. I find this action a bit awkward to do one-handed, at least for my size hand and the William-sized carabiner. But the sleeve locks automatically and positively when released, with a satisfying "click" (you still want to give a squeeze check, of course, to any locker).
The main uses I have for the Triact are in setting anchors in instructional situations (the locking mechanism deters casual playing around by students, especially youth) and in a pair with my Silent Partner. In most other situations where I want a locker, I prefer the William ball-lock or a screw lock.
Where to Buy
Here's what other sites are saying:
A large carabiner can come in handy in many places. Petzl's William Tri-Act Lock Carabiner's shape and size means it's useful for belaying and rappelling with the Munter hitch with single or double ropes, anchoring multiple ropes and slings and keeping the belay station organized.
William Tri-Act Locking Carabiner by Petzl - Buy Climbing at Mountain Gear Elegant European styling and a quarter century of experience differentiate Petzl's carabiners from the pack. This large, pear-shaped William Tri-Act Locking carabiner resists accidental opening, an ideal biner for belays and anchor systems.
- Mountain Gear
Well suited for use in belaying and organization of the work position.
Petzl William Triact-Lock Carabiner The SPECS Certification: CE EN 362, EN 12275 type B and H UIAA 3-year guarantee Weight: 88 g Breaking Strength: Major Axis: 25 kN, Open Gate: 7 kN, Minor Axis: 7 kN Gate Opening: 24 mm Materials: Aluminum 7000 ALL CLIMBING SALES ARE FINAL.