Could this be used on a window lock?

YES it can. but you need patience and practice... i am not very good with lock picking cant open a padlock or anything but i can open lockers and roof box locks with it and i opened the window lock of my bathroom before responding to this question.

can i use it to pick a banham lock

In short very very unlikely. Banham locks do make some pin tumbler locks but they are very high security with restricted keyways, and these picks are quite wide and would need both dimensions sanding down to fit. Also these are v difficult to work with. Unless you are a highly experienced picker, I reckon your chances are slim to zero... actually I am starting to wonder if this question is a joke...

Would the picks be able to unlock doors, say if I lost my house key?

Do you have a Yale type lock? if so then yes, you stand a good chance "if" your lock picking skills are good enough, if you have the barrel locks fitted to UPVC doors, then no this set really isn't up to the task. TBH it's more suited to small padlocks than door locks.

Is this as thin as a single card? If not then how thick is it?

It's 3mm thick, 86mm long and 55mm wide.The tensioner is 1mm thick and the picks, worm and rake are 0,5mm thick.It's a good novelty item, with some functional use, mainly simple padlocks etc.The feedback is ok, but due to thin metal, tendency to bend and eventually break.Just keep your local laws in mind, as carrying it around and being in possession may already be illegal.

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Credit Card Pick Set and FREE "How to pick cylinder locks" guide

Credit Card Pick Set and FREE "How to pick cylinder locks" guide

Product ID: 47887593

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Details

Brand
Rydowenna
Special feature
Compact
Item dimensions L x W x H
8.7 x 5.5 x
Material
Alloy Steel
Recommended uses for product
Discreet lock

💳Credit card-sized compactness

📚Includes expert lockpicking guide

🛠️5-piece professional pick set

Description

💳 Unlock your potential anytime, anywhere with the ultimate wallet-sized pick set!

COMPLETE 5 PIECE SET - Four precision picks plus one tension tool crafted from durable alloy steel and brass for reliable performance.
TRUSTED CRAFTSMANSHIP - Manufactured by Walker Locksmiths, ensuring professional-grade quality and durability.
LIGHTWEIGHT DISCREET - At just 25 grams, this set stays virtually unnoticed but always within reach.
ULTRA COMPACT WALLET FIT - Sleek credit card dimensions (8.7 x 5.5 x 0.5 cm) slide effortlessly into your wallet for on-the-go readiness.
BONUS EXPERT GUIDE INCLUDED - Master the art of cylinder lock picking with the free step-by-step 'How to pick cylinder locks' manual.

The Credit Card Pick Set by Walker Locksmiths is a compact, lightweight 5-piece lock picking kit designed to fit seamlessly into your wallet. Made from durable alloy steel and brass, it includes four picks and one tension tool, plus a free expert guide to mastering cylinder locks—perfect for professionals seeking discreet, on-the-go access solutions.

Specifications

Manufacturer	Walker Locksmiths
Part Number	15374499
Product Dimensions	8.7 x 5.5 x 0.5 cm; 25 g
Item model number	WALK-CP01
Colour	White
Style	White, Rectangular
Material	Alloy Steel, Brass
Shape	Rectangular
Item Package Quantity	1
Number of Pieces	5
Special Features	Compact
Included Components	4 picks, 1 tension tool
Batteries included?	No
Batteries Required?	No
Item Weight	25 g