how do i know if the keys will work on my doors

In my experience they work on original mortise locks. They didn't work on the one door in my house with a newer mortise lock I purchased in Home Depot

what is the bit length on these keys?

The bit blade part is 3/8" x 3/8". Thank you, NLS Products.

if these do not work on my 20s mortise door, can you recommend others to try?

They did not work on my old dresser draws. Take a photo of the lock, and try an old hardware store, if you can find one. A former coworker who lBrooklyn tolde some time ago that his local hardwarestore csrried. them.

My home was built around 1900. I know it takes a notched key. Will these work?

There’s no way to know but to try them. I did and they didn’t work for my lock so I took the lock out of the door (just a few screws) and brought it to a locksmith. They made keys that work for $20 each.

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Description

🗝️ Unlock timeless style and function with every turn!

BUILT TO LAST - Brass-plated zinc construction resists bending, ensuring reliable use over time.
DUAL TIP MASTERY - Flat tip for warded locks & notched tip for lever locks—unlock versatility in one combo.
EFFORTLESS HANDLING - Large head design offers superior grip and smooth turning every time.
COMPACT CONVENIENT - At 3-1/4 inches, perfectly sized for easy storage and everyday use.
UNIVERSAL COMPATIBILITY - Generic cuts crafted to fit a wide range of antique French doors and vintage locks.

The Lucky Line Skeleton Key 2-pack features flat and notched tips designed for warded and lever locks respectively, crafted from durable brass-plated zinc to resist bending. With a large head for easy turning and generic cuts to fit most antique door locks, these 3-1/4 inch keys are the perfect blend of vintage charm and practical versatility.

Specifications

Brand	Lucky Line
Special Feature	anti corrosion
Lock Type	Key Lock
Item dimensions L x W x H	3.25 x 0.25 x 0.75 inches
Material	Brass, Zinc
Recommended Uses For Product	antique french doors or other antique door hardware
Style	Antique
Color	Combo (87202)
Number of Pieces	2
Finish Type	Brass
Included Components	2 Skeleton Keys
Controller Type	Hand Control
Item Weight	9.07 g
Control Method	Touch
UPC	085721872020 733353701651
Model Name	Skeleton Key
Manufacturer	Lucky Line
Part Number	87202
Item Weight	0.32 ounces
Product Dimensions	3.25 x 0.25 x 0.75 inches
Item model number	87202
Is Discontinued By Manufacturer	No
Size	2 Pack
Finish	Brass
Item Package Quantity	1
Head Style	Flat, Open End
Special Features	anti corrosion
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Zinc

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