The GroundGrabba Tear Drop Hook Washer has been specifically designed to help you secure your outdoor equipment and or hardware. When the hole diameter you need to pass your GroundGrabba though is greater than the diameter of the GroundGrabba's head.
The collar diameter of the GroundGrabba Pro GR13 series is 1".
You wind your GroundGrabba Pro through the GroundGrabba Hook Washer HR13 then slide it up under the collar giving your GroundGrabba a collar diameter of 2 1/8"