Introducing biggest evolution of the Swanson Speed Square in almost 100 years. The Speed Square PRO. This revolutionary layout tool born out of the true legacy tool, the Speed Square is packed full of new features and has the same reliable features you have always counted on from the Swanson speed square making layouts even faster and easier. The speed square PRO starts with all the incredible features of the original speed trim square, then takes it up a notch. From a new 22.5 deg angle coming off of the pivot for quick layouts to an additional 5-1/2 in diamond mark for working with 2 x 6 material. It also has 1-1/2 in edge used to measure the width of 2X material for quick framing. The Speed Square PRO is the world’s most proficient tool designed for the true professional.2X longer scribe bar with 1/8 in increments and the diamond cut out bridge that adds support and the famous trademark Swanson Diamond cut out at the 3 in mark1-1/2 in edge, the width of 2X material mark both sides of studs22.5 deg angle coming off of the pivot for quick layouts5 in Diamond call out for working with 2 x 6 materialBeveled edges get the square closer to the working material resulting in more accurate top cut measurementsEasier to see numbers and markingsTwo convenient marking edges for 3/4 in and 1/2 inHigh-visibility, black gradations with a non-glare, matte finish for easy reading in any lighting conditions