They are in nice condition and have the proper springs for mounting on the original Zenith shafts. They are about 3/4 inches in diameter at the top where the Z emblem is, 1 3/16 inches in diameter at the base, and ¾ inches tall.
One has the pointer for the band switch. I got these all together, so I would assume they came from the same radio. These are ready to go on your radio.
Please see my other auctions for more interesting radio and phono items and tubes. The item "Set of 4 Matching Wooden 1930's Zenith Radio Knobs" is in sale since Sunday, June 28, 2015. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Tube Radios\1930-49". The seller is "jrcradio" and is located in Edmond, Oklahoma.This item can be shipped worldwide.