Dark brown, wooden knob with concave centre, two raised rings on top. Three raised rings on side profile with smooth grip and a simple straight up and down foot, 1" diameter and 29/32" high.  Fits a half round shaft with a spring, 1/4" diameter and 17/32" deep. **Note: Same on top and sides of Wooden Knob 10012 but does not have the pedestal foot that 10012 does.