ALVIN TrueAngle Adjustable Drafting Triangle Made of High Impact Acrylic 10 Model 110CB with Aluminum Thumbscrew and Inking Edge Includes Nylon Storage Case 10 Inches

Provides the features of a 45°/90° adjustable triangle plus those of a protractor. Angles from 0° to 90° can be drawn from the baseline with ½° accuracy. Die-engraved graduations for high visibility. The aluminum thumbscrew securely holds the selected angle and allows quick pickup and manipulation. Made of high impact acrylic that is 0.100 inches thick and optically clear to eliminate parallax and allow close pencil tolerance.