Shaft
Diameter
Inside Post
Diamter Round
Inside Post
Diamter Square
4x4 Post 6x6 Post
Wood Metal Wood Metal
6" 4-3/4" 4-3/4"
8" 6-3/4" 6-3/4"
10" 8-3/4" 8-3/4"
12" 10-3/4" 10-3/4"
14" 12-3/4" 12-3/4"
16" 14-3/4" 14-3/4"
18" 16-3/4" 16-3/4"
20" 18-3/4" 18-3/4"
22" 20-3/4" 20-3/4"