Adjustable Aluminum Circle Drafting Tool

This precision circle drafting tool is constructed from lightweight yet durable aluminum alloy and stainless steel, ensuring long-term corrosion resistance and minimal risk of rust. Its compact dimensions measure approximately 12.7 cm (5 inches) outer diameter and 7.9 cm (3.11 inches) inner diameter, with a low overall weight for true portability. The tool features a smooth, manually operated rotating adjustment mechanism — simply twist the concentric rings to expand or contract the perimeter — enabling accurate, repeatable circle drawing across a continuous range of diameters. Designed specifically for technical drawing, engineering sketching, architectural layout, and industrial measurement tasks, it delivers consistent circular geometry without reliance on stencils or digital aids.