https://www.simplyscuba.com/products/BlueOrb/8mmDomedNuts.aspx
The Blue Orb 8mm Domed Nuts replace your wingnuts for a more comfortable way to attach your backplate and wing to your twinning bolts or STA. Machined from heavy steel with knurled edges to tighted and loosen them and a domed shape for a smooth edge close to your back.
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