T&B 20 Inch (50cm) Flexible Curve Ruler Helix Drafting Drawing Measure Tool Soft Plastic Tape Measure Ruler Blue/White: Kitchen & Dining. Buy T&B 20 Inch (50cm) Flexible Curve Ruler Helix Drafting Drawing Measure Tool Soft Plastic Tape Measure Ruler Blue/White: Tape Measures - ✓ FREE DELIVERY possible on eligible purchases. √With CM and inches in two side . √Make smooth curves . √Hold shape . √Great for woodworking or craft project . √Precise measurements . Our flexible curve rulers are adjustable to hold shape and give precise measurements on curved edges. Raised edge lets you draw a line. Calibrated in 1/16-Inch measurements on one side and 1mm increments on the other side. Made of plastic. 20-Inch long. . . .