It is the series of precisely machined indexing holes and the spring-loaded, tight-tolerance indexing pin that meshes with them. The pin snaps into place giving you the confidence to know it is spot-on accurate. The blade features the same exclusive "saw-tooth" design scribing notches found in our new Stainless Steel Woodworking Squares. There's a every 1/16 inch all along the blade. Just drop your pencil in the and slide the head along the edge of your stock for a perfectly parallel line. Even the most skilled woodworker the challenge of placing accurate angles on large panel projects. This ruler allow you to measure with less error. The ruler is precise, versatile, and easy to use, measuring that's simultaneously set to every scale position with perfect, instant accuracy. Suitable for Woodworking Student Drawing Artist Crafts Stationery. Our latest ruler can provide unparalleled accuracy for your panel layout work. Just press the head to the desired angle, and then press the straight line., Manufacturer: Akfldms