I use the wall anchors is in addition to the enclosed when armored bolt lock bodies, not as shown on product image, only the anchor because the "fork" with the two cylinders off loosely through the lock body by fits and Two is better I thought (especially in an old building). Installation is very easy using 4 holes: 2x diameter 10 for dowels and screws and 2x diameter 12 as sinking of the two cylinders. Caution: The plugs and screws are not specifically included as Abus here apparently reckons that the the Tank latch, which would otherwise be used for the normal lock body, takes, so if you use both, make sure to first dowels and screws with sufficient large head (~ 12mm or slightly larger) get. The only small complaint I have is that no metal sleeves to the anchor, which would then disappear in the two holes in the masonry, thus you can see the masonry through the holes then, but then falls no longer as extreme by the enclosed cover on, Perfectionists improve themselves for something.