If you're into metal shaping with a bead roller, this hem roll set is super handy. It's made for creating a clean, folded hem on the edge of your sheet metal projects. The set fits most bead rollers that use 7/8 inch (22mm) diameter shafts – they mount with set screws. The dies are about 2 inches in diameter. You can use them to 'tip' the edge of the metal, starting a fold that you can then complete with a hammer or press. They're also great for making decorative impressions when used with a soft bottom wheel. Capacity-wise, it can handle up to 18 gauge mild steel, 16 gauge aluminum, or 21 gauge stainless steel. It might take a few passes to get the hem angle you want. A simple, effective tool for cleaning up edges and adding strength or detail to your metalwork.