GRS 004-559 Optional Steel Heavy Duty Mounting Plate NSK the second number is the

the second number is the distance between lines:

6 in (150 mm)

This second-generation model delivers 35% higher maximum power and welds 4× faster than its predecessor

Made in Vallorbe

also called shading gravers

GRS 004-559 Optional Steel Heavy Duty Mounting Plate NSK the second number is theThe GRS 004 559 Optional Steel Heavy Duty Mounting Plate is a sturdy steel plate designed for use with compatible GRS workbench setups. This plate serves a dual purpose: functioning both as a heavy duty mounting surface and as a steel block directly on your workbench. For customers ordering a John Frei custom workbench through Otto Frei, this plate can be professionally mounted at the time of workbench fabrication upon request. Features Heavy duty