For Doors Wood or metal. 1-3/4" (44 mm) thick standard. minimum stile with trim and 3-1/2" Mounting Supplied standard with wood and machine screws Chassis Cover Cold drawn brass, bronze or stainless steel Chassis Nonferrous alloy Hand Handed. Specify RHRB or LHRB Dogging Feature Allen-type dogging furnished standard. Top and Bottom Bolts Brass, stainless steel