Here are a few spiral fluted bolts that I fluted
https://scontent-a-iad.xx.fbcdn.net/...76016806_n.jpg
https://scontent-b-iad.xx.fbcdn.net/...21153897_n.jpg
https://scontent-a-iad.xx.fbcdn.net/...07216259_n.jpg
https://scontent-a-iad.xx.fbcdn.net/...92273437_n.jpg