0.625 inch to 1.5 inch clamping range with 1 inch ball.

• The perfect mounting base for quick and easy tool-less installation and removal on round, square, odd-shaped rails and bars
• High-strength glass-filled nylon construction with corrosion resistant stainless steel hardware
• Rubber pads provide stable, even gripping and protection of mounting surface
• Ideal for mounting tablets, action cameras, smartphones and much more in a wide variety of applications
• Made in the U.S.A.
• Perfectly suited for mounting on the handlebars, racks and roll cages