This Vernacular style four fold door knob was made by F.C. Linde in the 1885 catalog. It is part of the H-21910 group. Set includes two bronze knobs with a spindle and two cast iron back plates. Priced as a set. The dimensions are Knob 2.125 in. diameter x 2.25 in. D, plate 5.0625 in. H x 1.625 in. W x 0.25 in. D, collar 0.625 in. diameter, drop 2 in.