The shaft is 3/4 inch diameter. The threads are 7/16 inch diameter.
Just the handle is 4+3/8 inches long. These would be great if you were missing handles on a bronze wheel you had.
The item "2 BRONZE SHIPS STEERING WHEEL SPOKES SAIL BOAT SHIP (D1.5A541)" is in sale since Wednesday, April 1, 2020. This item is in the category "Antiques\Maritime\Maritime Wheels". The seller is "pumpkins699" and is located in Alberton, Montana. This item can be shipped worldwide.