Yale Assure Lock SL YRD256 Installation And Programming Instructions page 23

Preparing Door & Frame
Necessary for new doors or adjusting existing prep.
(25mm)
Dia.
2-1/8
11
.✓ (56:~)
! ......
2-3/8
11
(60mm)
or
2-3/4 11 (70mm)
Backset
Drill holes 1 /2 way
through door then
complete from other side
to prevent splitting.
1 11 (25mm) Dia.
1 11 (25mm) Deep
ISL-1286-07
YRD-MNL -0006