Visio Putting Gates are simple and easy to use devices that give you feedback on your ability to hit your starting line. The Visio gates come in a pack of 3 sizes (55m, 50mm and 60mm) which when placed at specific distances from the ball, on your chosen target line, will create a specific angle of error that you will need to achieve in order to successfully putt the ball through the gate. 50 mm @ 17 inches requires 0.5 degree of error or less50mm @ 11 inches requires less than 0.75 degree of error 55mm @ 14 inches requires less than 1 degree of error55mm @ 19 inches requires 0.75 degree of error or less 60mm @ 40 inches requires less than 0.5 degrees of error 60mm @ 20 requires less than one degree of error Practicing with the gates on your...