Review on 🔒 Kai Tian 6 Colorful, Polished Stainless Steel Watch Band with Quick Release, Perfect for Flexible Watch Straps - 7 Rows, 20mm/22mm, Bracelet Deployment Clasp (Black, Silver, Blue, Gold, Rose Gold, Two-Tone IP Black) by Sarah Salinas

Although the Samsung Watch 4 says 20mm, the watch size is 19.7 and the strap is 19.88. Since the strap is metal, you cannot attach it unless you grind off some of the metal. Since it's black, grinding or polishing is quite noticeable. The band seems comfortable and of good quality. Too bad it doesn't match the watch. I would rather consider this a Samsung bug; However, the complement to this watch boasts that it is compatible with the Watch 4. And she definitely isn't.