Flexible Rotating Circle Drafting Tool

Crafted from high-grade aluminum alloy and stainless steel, this drafting tool offers excellent resistance to corrosion and surface degradation under regular use. Measuring approximately 12.7 cm (5 inches) in outer diameter and 7.9 cm (3.11 inches) in inner diameter, it balances compactness with functional reach. Its core innovation lies in the seamless rotating adjustment system: two interlocking rings rotate against each other to enlarge or reduce the effective drawing perimeter continuously — no tools, no calibration, no compromise on accuracy. Intended for professional and educational applications including mechanical drafting, product prototyping, signage layout, and craft-based design work, it replaces inconsistent manual compass methods with repeatable, hand-guided circular geometry.