Prime-Line U 9970 Deadlock – Jimmy-Resistant Design Prohibits Forced Entry by Spreading of Door Frames – Single Cylinder Diecast Metal Lock With a Brass Finish and Angle Strike (Single Pack)

https://www.amazon.com/Prime-Line-Products-9970-Cylinder-Jimmy-Proof/dp/B000BDB4Q0/ref=asc_df_B000BDB4Q0/?tag=hyprod-20&linkCode=df0&hvadid=193154321880&hvpos=&hvnetw=g&hvrand=14088322968067415716&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9004392&hvtargid=pla-309974329855&mcid=bed1ad6abd1e3a02900076b1cc8a53b5&gclid=CjwKCAiA4smsBhAEEiwAO6DEjXNjPPVhmXiWdTu8GwwYt0gt1ONAF8MQnqxTrsVhKmSoVZYDqgEwfhoCoDIQAvD_BwE&th=1

deadlock

very helpful video: https://www.youtube.com/watch?v=05c6-JCjXAU