This is a Full Mortise lock for Vintage and Antique Roll Top Desks. It is made of Brass and the lock, housing and bolt are made of steel. The Locking mechanism measures 1 15/16"+- in Depth (Mortise Depth) 1 3/4"+-  wide (mortise width) By 3/8"+- thick (mortise thickness). The Locking mechanism mounting plate measures 3 1/4"+- long by 5/8"+- wide and is 1/16" thick.  The strike plate has a self closing lid and measures 2 3/8"+- long by 13/16"+- wide with the mounding plate being 1/16"+- thick....  Lock comes with all mounting hardware. (4RTLRT)