These post collars come with a pre-installed eye lag and slip right over our 1 5/8-inch posts. These collars slide down to any position you want and are intended to be used with our tension cable and Gripples to help existing customers expand their dog fence kits. Each pack is enough to help enclose 100 linear feet of our 4, 5 and 6 foot tall fences, and 50 linear feet of our MAX Strength Kit. There are 10 round post collars in this kit.