United States Powerlifting Association (USPA) - Grip rules for Bench: See that ring about an inch to the left the lifters' pinky? That's the 81cm mark, and is the max allowable grip
The Bench Press; A Bio-Mechanical Assessment - Taylor's Strength Training
The Bench Press: Effects of Changing Grip Width and Incline Angle
Close-Grip Bench Press | How To Guide | Mathias Method Strength
Wide Grip Bench Press: Is It Better? (Definitive Guide) | PowerliftingTechnique.com
How Wide Should Your Bench-Press Grip Be?
Powerlifting Rules For Bench Press (Complete Guide) | PowerliftingTechnique.com
7 Types of Bench Press Grips — Benefits and How to Use Them | BarBend