HWG138 Tru Hone Honing Wheel Gauge

HWG138 Tru Hone Honing Wheel Gauge measures HW100, HW220, HW400 & HW600 grit honing wheels to gauge whether or not they are suitable for redressing. If the HWG138 does not slide over the top edge of the honing wheels they should be large enough to be redressed. Honing wheels are too small to be redressed if the HWG138 slides over the top edge of the honing wheels. The shortest radius must be 1 3/8" (3.5cm) or more.