What is the difference between “one size”, “screw lock” and “triact lock”??

Not sure about one size, screw lock- it has a s screw lock on the gate of the carabiner, and tract lock is a triple locking action on a carabiner.

I would like to purchase 5 caribeners that have the green button dual lock system. which option do i choose? one size, screw lock or triact?

The one you are looking for is the ball lock, which we currently do not have. We have the screw lock in stock.

will this work with a Sterling ATS?

I am familiar with the Sterling ATS, but have not tried to use the Petzl with it. I suspect it will work/fit the connection hole in the Sterling.

This picture is not the petzl am'd pin lock, which product would i receive the am'd pin lock or the boll lock shown?

You would receive an AM'D Pin-Lock. We're working with Amazon to have that image corrected. Thanks!

Petzl Unisexs William Carabiner Black Uni

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

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41787CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

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Description

🔗 Elevate your climb with the carabiner that’s as serious about safety as you are.

LOCK IT DOWN - Choose from advanced TRIACT-LOCK or BALL-LOCK systems for effortless, secure locking every time.
TWIST FREE TECH - Pair with CAPTIV bracket to prevent twisting and keep your setup rock-solid and safe.
SEAMLESS HANDLING - Edge-free interior and keylock design ensure smooth clipping and unclipping—no snag, no fuss.
CERTIFIED CONFIDENCE - Backed by CE EN 362, EAC, and NFPA 1983 certifications, trusted by pros worldwide.
FEATHERWEIGHT STRENGTH - At just 75 grams, this aluminium carabiner slashes your gear weight without compromising durability.

The PETZL William Carabiner is a lightweight, aluminium D-shaped locking carabiner designed for professional abseiling and workplace positioning. Featuring advanced locking systems (TRIACT-LOCK and BALL-LOCK), a smooth keylock design, and compatibility with the CAPTIV bracket to prevent twisting, it combines safety, ease of use, and durability. Certified to CE EN 362, EAC, and NFPA 1983 standards, it’s a trusted choice for climbers and professionals seeking reliable gear.

Specifications

ASIN	B01ANZF4N4
Best Sellers Rank	92,848 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 326 in Locking Carabiners
Brand	PETZL
Brand Name	PETZL
Colour	Grey
Country Of Origin	France
Customer Reviews	4.8 out of 5 stars 164 Reviews
Global Trade Identification Number	03342540102453
Included Components	Carabiner
Item Shape	D-Shape
Item Weight	75 Grams
Item weight	75 Grams
Lock Type	Ball Lock, Triact Lock
Manufacturer	Petzl
Material	Aluminium
Material Type	Aluminium
Recommended Uses For Product	Abseiling
Recommended uses for product	Abseiling
Shape	D-Shape
Unit Count	1.0 count

Reviews

A**D

Mousqueton pratique

Mousqueton très pratique, parfait pour l'escalade, Petzl est une marque fiable, acheté pour aller avec une sangle d'escalade Petzl et fonctionne très bien avec. Bien solide et bien fiable, je recommande

29.07.2022

A**I

Excellent

These are worth every penny and are excellent in professional use during tree jobs. I definitely recommend these to anyone.

10.03.2026

H**S

Hoogwaardig product

Perfecte kwaliteit, kwam zorgvuldig verpakt aan. Ik ben hem nergens anders tegengekomen voor deze prijs.

16.02.2026

F**A

Soddisfatto

Ho acquistato il moschettone petzl iD. È arrivato prima del previsto, integro e con tutte le certificazioni . Grazie

17.08.2023

M**Z

Producto de calidad y seguro

Completamente satisfecho. El envío fue rápido y llegó un día antes de lo esperado.

18.03.2026

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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41787CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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