Drilling jig to prepare the gate-/strike-post for LA- / LE- / LM-locks and according keeps (SA / SH / SM). The jig can be adjusted for profiles 1" / 1-1/4" / 1-1/2" / 1-3/4" / 2" / 2-1/2". The jig guarantees a perfect center alignment of the lock/keep on your posts.