The 591 manual flush bolt is for wood doors and is UL listed. It is constructed of solid brass. The face plate is 1 x 6-3/4 inches. The mortised body is 6 inches high by 1-3/8 deep by 1 inch thick. The screw spacing is 1/2 by 6-1/4 inches on centers.
The 590 is made of solid brass and ships with matching screws. The faceplate measures 1 x 6-3/4 inches, the strike is 15/16 x 2-1/4 inches and comes standard with a 12 inch rod. The mountng screws are 1 x 6-1/4 inches on centers.