With this Creative Grids Triangle Quilt Ruler you'll be able to cut 30 and 60 degree angles for a finished size of 8 inches.
 
This ruler is easy to read with black and white markings printed right on the tool. It slides easily over the fabric until pressure is applied and the Creative Grids exclusive grip holds the fabric in place while cutting, eliminating slipping and miss-cuts!
 
Plus, the quilt ruler comes with fully illustrated step-by-step instructions and access to a how-to video.