EASILOK SK4510S(sfic): Universal Handing Mechanical Keyless Storefront Door Deadlatch | SFIC Key Override | Drill-Free DIY Adams Rite 4510S Replacement with Push Paddle 31/32" - Black Color:Black 1: The ONLY keyless mechanism-based

1: The ONLY keyless mechanism-based  Storefront Door Lock in the world:  https://www

b: Backset: 31/32"

then mortise is maybe a flush bolt mortise

C： When you couldn't determine wether the backset is 31/32" or 1

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