Check the listing for details. Brush Research BC4M18 FLEX-HONE. Condition: New. Listed at 14.99 USD. Brush Research BC4M18 FLEX-HONE®, 0.157" (4mm) Diameter, 180 Grit, Silicon Carbide Abrasive (Pack of 1) [QUALITY]- Proudly Made in the USA. The FLEX-HONE is long lasting, lowering total cost of use compared to other brush options.[DESIGN]- The FLEX-HONE is manufactured to be self-centering, self-aligning and self-compensating for wear for easy use.[FINISHING BENEFITS]- Offered in a wide variety of grits and abrasives to allow machinists to achieve specific finishing tolerances as well as a beautiful crosshatch finish.[CROSSHOLE DEBURRING]- Ideal for finishing and deburring simultaneously in a single setup. Can be used in virtually any rotating spindle.[SILICON CARBIDE ABRASIVE]- Excellent on mild steel, stainless steel, cast iron and other softer ferrous materials.