Vemco Antiflex drafting machine scale features a clear plastic body reinforced with a sturdy aluminum rib for precision and durability. This professional-grade AP-33 model is designed for accuracy in technical drawing and architectural work, offering dual scales with 1/2 in. = 1 ft. and 1 in. = 1 ft. markings. Made in the USA, it includes the original protective box and foam insert to maintain its condition. The clear plastic edges allow for easy visibility of the work surface underneath while the aluminum core prevents warping or flexing during use.