1、The wire brush set is made of pure brass, which is durable and has a long service life, suitable for the most demanding cleaning tasks 2、These wire brushes can remove burrs, rust, dust, and remove oxide layers, scale and paint in hard to reach areas 3、Using 1/8in chuck to install on your hand drill, drill press, and rake tools, very convenient 4、There are 3 different styles in total in the package, which can be applied to various places 5、Brass wire wheels have stable structure, excellent performance and long using time 30 x Pen Shape Brushes30 x Bowl Shape Brushes30 x T Shape Brushes Item Type: Brass Wire WheelsMaterial: Brass + steelSpecification: (size error ±2%)Pen Shape Brush: Diameter: Approx. 6mm / 0.2in, Length: Approx. 40mm / 1.6inBowl Shape Brush: Diameter: Approx. 13mm / 0.5in, Length: Approx. 45mm / 1.8inT Shape Brush: Diameter: Approx. 22mm / 0.9in, Length: Approx. 40mm / 1.6inShaft: 1/8in(using 1/8in chuck)