This item is a swimming pool cover clip for above ground pools. Used to hold the light weight tarp like covers down so wind does not blow under the cover and rip your expensive cover to shreds. I have printed this item in ABS and PLA and both seem to have the same grip. I had to add extra shells because the middle would not fill in at first. It was made with Google Sketchup. This is my first print and first thing to upload to thingiverse.