Shutter Catches. These typically mount at the bottom of the shutter and latch to the sill of the window. These can only be used when you can open your window and access the rear of your shutters. The set comes with one latch an one catch, you will need two sets for each pair of shutters. Both pieces are made of cast iron. We recommend you prime and paint these before installation and screw them in with a screwdriver by hand, not with a drill. These do not come with screws.