Here’s the guns that the size they recommend would fit
Size 16
5.5"-6.5" S&W K, L, N frame Colt Python/King Cobra; Ruger GP100/Security Six; and similar Taurus and Rossi revolvers; Ruger Redhawk; similar Rossi, Taurus, Llama revolvers; Ruger Blackhawk/Super Blackhawk revolvers