Armor-Tool PF-4 Dog Fence Armor auto-pro dog fences easily slide into any dog hole with a minimum 34 diameter and allow you to position and Brace materials or set up corners Dog fences are Reversible with heights of 1 1/4 on tall side, 5/8 on short to accommodate variations in work material Dogs fit into a track under the dog fence, and spacing can be easily adjusted to achieve a variety of angles Comes with two 3 tall, 34 diameter dogs Ideal for use with armors auto-pro horizontal and in-line dog Clamps