Albert Swanson invented the speed square in 1925, and the company still makes the definitive version: framing square, try square, miter square, protractor, saw guide, and more in one tool. Available in 7-in and 12-in sizes. The 7-in rides in an apron; the 12-in lays out rafters and wide stock.

Specifications:

• Options: 7 in; 12 in
• Notches: 1/4-in and 1/2-in spaced for line scribing
• Functions: framing square, try square, miter square, protractor, saw guide, and more
• Heritage: Swanson invented the speed square, 1925
• Made in: USA by Swanson