This is a 2" Diameter Fine Donut Wheel by Saburr Tooth designed specifically for the Proxxon Longneck Grinder.
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The Saburr Tooth Carbide Carving Wheels are very popular with power carvers. The wheels feature long-lasting razor sharp carbide cutting teeth arranged into a unique open pattern that resists loading, provides for fast cutting and gives better control. The wheels are available in 2" and 4" diameter. The 2" wheels are designed for use with the Proxxon Longneck Grinder and the 4" wheels for use with most 4" and 4-1/2" angle grinders with a 5/8" bore. Available in 3 grits: X-Coarse (Orange), Coarse (Green) and Fine (Yellow). Made in USA.