戒指成型心軸，方形輪廓 — 實心鋼、13 英吋、從 15 × 15 毫米漸細至 6 × 6 毫米

The square edges on this mandrel are precise and sharp, exactly what I needed to keep 10mm sterling silver wire from rolling over. It’s heavy enough that it doesn’t shift on my bench while I’m hammering.

Finally, a mandrel that keeps my square wire crisp—the taper from 15mm down to 6mm is perfect for sizing rings without wrecking the edges. Corners stay sharp through every hammer blow, no more rounding over.

I was worried the tapers would be too abrupt for my smaller ring sizes, but the 15mm to 6mm range handles them perfectly. The steel really does keep those sharp corners crisp, no rounding at all. Only wish it had a slightly smoother finish right out of the box.