Water & Wood R4-24mm Measure Tool Toothed Blade Metal Radius Gauge Gage

Product Description Radius gauges require a bright light behind the object to be measured. The gauge is placed against the edge to be checked and any light leakage between the blade and edge indicates a mismatch that requires correction. It is a kind of observational measurement because of its visual test way. R4-24mm includes 15pcs at each end, radius as 4mm, 5mm, 4.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 6mm, 18mm, 19mm, 20mm, 22mm, 24mm.