Backplate specs: Width is 1". H is 2 1/2" for 1/2" and 3/4" diameter rods; 3" for 1" and 1 1/4" diameter rods; and 3 1/2" for 1 1/2" diameter rods. Arm height is 1/2" greater than largest rod diameter.
Backplate specs: Width is 1". H is 2 1/2" for 1/2" and 3/4" diameter rods; 3" for 1" and 1 1/4" diameter rods; and 3 1/2" for 1 1/2" diameter rods. Arm height is 1/2" greater than largest rod diameter.