三角鑲座心軸（3.5 至 9.5mm）

Finally, a mandrel with corners that are actually sharp enough to form a clean triangle bezel without marring the metal. The 9mm handle gives a solid grip, and the full 8.5 inches of graduated sizing covers everything I need for my smaller projects.

The graduated marks from 3.5 to 9.5mm are spot on for sizing bezels, and the handle is thick enough to grip comfortably without slipping. Works perfectly for my wire wrapping projects, and the corners are as nice as advertised.

I was pleasantly surprised by how smooth the tapered triangle corners are—no snagging or marks on my bezel wire at all. The 8.5-inch graduated portion gives me plenty of range for rings from 3.5 to 9.5mm. It's a solid, well-made tool that does exactly what I need.