Swanson Tool S0101 7-inch
Speed Square Layout Tool with Blue Book

• The Swanson Tool SO101 7-inch Speed Square is
  a popular pocket-sized square that incorporates features of the framing square,
  tri, miter, and protractor squares.
  Common rafter and hip/valley rafter scales permit one-number references for all cuts.
  The square is merely rotated to the proper roof pitch value on either scale to assure
  the correct angle cut.
  The slot along the scales will accommodate an adjustable locking pin
  for repetitive cuts using any 1/4-inch bolt and nut.
  Comes with a handy, 62-page pocket sized booklet that provides vital instructions,
  reference diagrams, and tables for the construction of roofs and stairs.
• Item Weight : 8 ounces
  Product Dimensions : 1 x 8 x 8 inches
  Item model number : S0101
• 7-Inch speed square; fits in pocket
  Incorporates features of framing square, tri square, mitre square, and protractor square
  Constructed of aluminum alloy