Does not include Screws, which are optional on the top lip to securely hold adapter if needed. Most probably won’t need any type of screw, as the lip will provide enough retention to prevent easy pull out.
Dimensions are listed within the photos of this listing.
WE HAVE A GREAT REVIEW FROM A CUSTOMER WITH IN USE PHOTOS HERE

































Great product! Well made and rugged. Would recommend that you do NOT just drop your garage door on the unit without wood support around or, if you insist on doing so, doing it further back where there is more support. This thing really IS rugged, but it’s not invincible and I cracked mine like an idiot while trying it out. But, it’s still functional, which just speaks to the workmanship.