The FLEX-HONE flexible cylinder hone is a resilient, flexible honing brush with silicon carbide abrasives for use on mild steel, stainless steel, and cast iron. Brush provides soft cutting action and removes burrs from cross-drilled holes. Independent suspension ensures self-centering, self-aligning to the bore, and self-compensating for wear. Honing brush is compatible with automated and CNC equipment to automate the debarring process. Use for finishing work on any type and size of cylinder. GBD Series for block cylinders or liners in heavy-duty applications. Flexible Cyl Hone, Bore Dia.3in, 320 Grit This product contains a chemical that is regulated under California Proposition 65. Warning This product contains a chemical known to the State of California to cause cancer. Warning This product contains a chemical known to the State of California to cause birth defects or other reproductive harm.