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.

ASIN	B000LNQO8I
Best Sellers Rank	267,206 in DIY & Tools ( See Top 100 in DIY & Tools ) 353 in Lock Replacement Parts
Brand	Lucky Line
Colour	Combo (87202)
Control Method	Touch
Controller Type	Hand Control
Customer Reviews	4.1 out of 5 stars 1,705 Reviews
Finish	Brass
Included Components	2 Skeleton Keys
Item Dimensions	8.3 x 0.6 x 1.9 centimetres
Item Type Name	1 Flat Tip - 1 Notch Tip
Item Weight	10 g
Item dimensions L x W x H	8.3 x 0.6 x 1.9 centimetres
Item height	0.75 inches
Lock Type	Key Lock
Lock type	Key Lock
Manufacturer	Lucky Line
Material	Brass , Zinc
Model Number	87202
Recommended Uses For Product	antique french doors or other antique door hardware
Recommended uses for product	antique french doors or other antique door hardware
Special Features	Key Unlock
Special feature	Key Unlock
Style	Antique
UPC	085721872020 733353701651
Unit Count	2.0 count

Lucky Line 87202 Skeleton Keys-2PK Skeleton Key

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