Lockly SECURE Installation Manual page 17

STEP 7: INSTALLING THE DOOR STRIKE
Close your door to see if your lock closes securely with your existing door strike. If
the lock closes securely, you may keep the existing door strike without removing the
old hardware. However, it's recommended that you use our door strike.
Make sure the slanted side of Part F1/F2 is closing against
the slanted part of Part H before fixing it on to door frame.
F
DOOR STRIKE INSTALLATION