4" X .012" WIRE WITH 1/4" HEX SHANK COARSE WIRE WHEEL - It's designed for easy access into narrow holes and confined areas. This wire wheel brush features crimped style wire which is ideal for light to medium-duty applications. It removes rust, scale, paint, and weld spatter in hard to reach areas. Designed for use with common 1/4 in diameter electric power drills or pneumatic (air) drills.