Especially suitable for processing brass, brass alloys, copper, precious metals, semi-precious stones, plastic, and wood. Ideal for cleaning electronic components and circuit boards. Shaft diameter 2.35 mm. Delivery includes: 2 brushes. Note: Use brushes and brushes only with gentle pressure and the recommended speed. Excessive pressure will cause the individual wires to bend too much and straighten out due to centrifugal force. This excessive bending fatigue of the wires at the holder can lead to notching effects, which may result in breakage.