Physical Dimensions: Overall (as if installed): 7 13/16 x 7 13/16 x 1 7/16 in. (19.9 x 19.9 x 3.6 cm)
Plate-a: 7 13/16 x 7 13/16 x 11/16 in. (19.9 x 19.9 x 1.7 cm)
Nail-b: 3 5/16 x 7/8 in. (8.4 x 2.2 cm)
Center Plate-c: 3 3/16 x 3 1/8 x 1/2 in. (8.1 x 7.9 x 1.3 cm)