Acme, Lull & Porter Shutter Set of 4 Hinges, 3-1/8" wide when open. ALP hinges are mortised into the edge of the shutter and window casing. They use a once-patented design that helps lock the shutter into the open position. The shutter is lifted up slightly to disengage the hinge and allow closure. The shutter can also be removed entirely without tools. ALP hinges are left-handed or right-handed and are marked as such. Each hinge has two halves, one side with a pintle and one side with a gudgeon. The pintle half is mounted on the window with the pintle pointing up. Offset is measured from the casing or shutter edge to the corner of the pin. This is a set of four hinges includes two left-hand and two right-hand hinges, to hang a pair of shutters on one window. Also includes two sets of fasteners. Does not include mounting screws. Raw cast iron, must be painted with an oil-based exterior grade paint to prevent rusting. The selection of the proper sized ALP hinge will depend on the amount of throw that you need, the amount of wood trim that is available for mounting, and the size of the shutters. Set of four hinges includes two left hand and two right hand hinges, to hang a pair of shutters on one window. Also includes two sets of fasteners. Does not include mounting screws.