Dark brown, wooden knob, has a convex centre decorated with a 12-petal flower and two rings, the outer one of which is raised. The diameter is 1 21/32"  and the height is 13/16". The grip is one protruding ring. The short pedestal has one ring at the foot. Fits a round shaft 1/4" diameter with a set screw, and 19/32" deep. One only.