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!

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PETZL Unisex's William Carabiner, Black, UNI

Product ID: 59532451

Details

Brand
Petzl
Colour
Black
Item weight
0.23 Pounds
Material
Aluminium
Recommended uses for product
Climbing

🔒Dual locking: TRIACT-LOCK & BALL-LOCK

⚖️75g ultra-lightweight aluminium

🛠️D-shape optimized for abseiling & positioning

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	B01AS2OCFI
Best Sellers Rank	117,716 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 412 in Locking Carabiners
Brand Name	Petzl
Colour	Black
Customer Reviews	4.8 4.8 out of 5 stars (95)
Included Components	See the description
Item Dimensions L x W	28L x 28W millimetres
Item Shape	D-Shape
Item Type Name	Carabiner
Item Weight	0.23 Pounds
Lock Type	Ball Lock, Screw Lock, Triact Lock
Manufacturer	Petzl
Material Type	Aluminium
Product Warranty	Manufacturer
Recommended Uses For Product	Climbing
Unit Count	1.0 count

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