Backplate specs: Width is 3/4". 3" H for 1/2" and 3/4" diameter rods; 3 1/2" H for 1" and 1 1/4" diameter rods; 4" H for 1 1/2" diameter rods.
Backplate specs: Width is 3/4". 3" H for 1/2" and 3/4" diameter rods; 3 1/2" H for 1" and 1 1/4" diameter rods; 4" H for 1 1/2" diameter rods.