Post retrofit collars for 1 5/8 posts (standard round fence post size). These all black fittings are used to attach cable or fence ties to posts; they can be adjusted up and down the post in any position then tightened. These retrofit collars can be slid on from the side and tightened with a wing nut. This is useful when adding post cable collars to an existing fence that's attached with fence ties up and down the post. Standard cable collars slide down over the top. These are side mounted and not shipped with any of our fence kits, please ask any questions before purchasing - these are unique and specific for certain applications only.