If you double-click on the Snap to Grid you will see a dialogue box with all the snap to grid options. I do not use Snap to Grid very often, usually because I’m drawing relative to other objects. But when you need to draw a objects, like this wall, and you want control the length of it, use the snap to grid with a large grid setting so that you can draw the wall quickly. In this example I have used a wall, but this equally applies to other situations like set design and landscape. If you want more information about Snaps, have a look at my Guide to Productivity available here.