Woot offers EXXO 5535 Combination 4 PC Metal Machinist Square Tool Set - Precision Level Straight Edge Ruler & Angle Finder Tools for Woodworking, Welding, Carpentry & More for $23.99 (orig. $39.99). Free shipping for Prime Members.

Product Description:
PERFECT & TRUE: Our tool box set contains small and large squares in four different sizes measuring, 2, 3, 4 and 6 inches in length. The squares are accurate inside and outside to within 0.0008" inch so you can measure twice and cut once.

•  SMART DESIGN: This combo of machinist squares are easy to pack when going between jobs thanks to the setup of the wooden cafe. Finding and keeping track of your engineering equipment and system accessories has never been easier.
•  ENGINEER & CRAFTSMAN ESSENTIALS: Our tools keep you working with speed and accuracy to knockout any size project. These instruments guide measuring, marking, leveling, engraving, drafting, cutting, milling, scoring, centering, framing, and more.
•  SUPER HEAVY DUTY: Our items are made from the finest, top quality, smooth ground steel. Each blade edge is hardened and ground for the right measurement, scale, depth, and degree of straightness and parallelism.
•  VERSATILE: Our combination square kit is a tactical, clear choice for any home improvement, mechanical fabrication, or construction shop. Strong squares for positioning stone or wood tile, crown molding, trim, and drywall, for the perfect finish.