(Note: Measurements are outside max. dimensions unless stated otherwise).
19th Century : An exceptionally large lion masque door knocker with classic Regency crossed ribbon and reeded ring.
Distance between studs centre to centre 168mm. (6 3/4")
BACKPLATE
Diam. 218mm. (8 1/2")
Ring diam. 233mm. (9 1/4")
Option : Octagonal capstan brass nuts.
Diam. 31mm. (1 3/16")
Width side to side 29mm. (1 1/8")
Option : Round bell brass nuts.
Diam 21mm. (13/16")
Height 8mm. (5/16")
Option : Square brass nuts with chamfered sides.
18mm. (11/16") x 18mm. (11/16") x 10mm. (3/8") (variable).
Height 18mm. (11/16")
Maximum door thickness 102mm (4").
Supplied with 3 x No. 102mm. (4") x 9mm (3/8") mild steel threaded rods with with washers. (Will need to be cut to length).
Steel pivot pin. 
Hinge has limiter to prevent over-enthusiastic operation.