HOW IT WORKS 

Simply place the square on a flat surface with your golf ball resting on the hole 'A'. Your intention is to putt the full length of the square without it veering off to either side. Holes along the length of the square enable you to putt over a shorter distance. By placing your ball on hole 'B' and placing tees in the holes to the side according to your putter width enables you to make your putt knowing you have hit the ball squarely with the centre of the putter.