Don’t install a lock in a hollow metal door without Door-Core. The Door-Core metal door reinforcer is a fast, economical and dependable means of reinforcing a hollow metal or hollow wood door at the point where a cylindrical lockset is to be installed.Sold5 Pack.
Note: These are shipped flat. You need to bend them to fit. Instructions are included.

• May be used for cross bores of 1 1/2″ to 2 1/8″
• May be used on hollow wood or metal doors
• May be used on doors 1 3/4″ thick or thinner
• Eliminates “disengaged latch bolts or dead bolts.
• Centers and supports the bolt
• Eliminates binding caused by misalignment
• Prevents foreign material from fouling the lock
• Increases security, prevents “ice-pick” attack
• Used by commercial and government agencies