Unique precision tools designed to measure the radius and diameter of objects Centre cut out to measure diameter, side cuts to measure radius and 150mm metric rule for length Pocket size available in two different size ranges Manufactured from hardened Japanese stainless steel Made in Japan Radius Range: 0.5 - 7mm Radius Graduations: 1mm Diameter Range: 0.5 - 6mm Rule Range: 0 - 150mm Rule Graduations: 0.5mm Overall Thickness: 0.5mm Overall Width: 15mm Overall Length: 175mm