With a silicon carbide abrasive, these hones are the best choice for steel and stainless steel. They’re sharp enough to remove material while leaving a cross-hatch patterned finish that retains lubricant. Hones have abrasive-embedded balls on flexible spindles to press against the inside of cylinders. They perform best on steel and stainless steel but are also a good all-around option for other materials. Hones are slightly oversized for maximum contact with surfaces. When your cylinder ID falls between two sizes, order the larger hone. Use them with portable drills, drill presses, and CNC machines. Hones should be rotating when inserted or removed from cylinders. We recommend using them with honing oil to keep the abrasive surface free of debris.