Use the catalog dimensions as a starting point. Fit still depends on build, wrist size, and how you want the piece to sit.
The selected 4mm and 5mm tennis chains and 10–12mm Cubans are being quoted in 18–24 inch lengths, with 16 inches retained for tennis.
Measure around the wrist where you want the bracelet to sit, then allow extra room for comfort. The shortlisted radiant and emerald tennis bracelets are cataloged at 8 inches, so confirm that length works for you before ordering.
The selected eternity bands are cataloged primarily in US sizes 6 through 11. The supplier's fixed men's ring page uses decimal sizing such as 8.25, 8.70, and 9.05; we are confirming that convention before publishing it as a normal customer selector.