金屬方形平項圈附內六角鎖

The squared edges feel really solid against my neck, not flimsy at all, and the Allen key lock gives me total peace of mind that it's not coming off unless I want it to. Wore it for a few hours and forgot it was even there.

The Allen key lock is what sold me—it’s solid and feels genuinely secure, not flimsy like some magnetic clasps I’ve tried. The flat metal is cool against the skin at first but warms up fast, and the squared edge adds a nice, discreet weight.

The squared shape sits flush against the neck without digging in, and the Allen key lock gives me total peace of mind that it's not coming off accidentally. Solid feel, smooth edges, exactly what I wanted for longer wear sessions.