Carter & Son Toolworks 5/8" Bowl Gouge Made in the USA! The M42 Cobalt HSS blade is backed by a 16" aircraft aluminum handle to provide stability. This massive tool has an overall length of approximately 26-1/4". The tool blades are precision machined to high tolerances from solid M42 Cobalt High Speed Steel stock. To further increase strength the blades are certified heat-treated to 68HRC.