Specification: Item Type: Carbon BrushesMaterial: CopperSize: Approx. 6.5x7.5x15mm/0.26x0.3x0.6inApplicable for: Electric hand drill, angle grinder, blower, mixer, trimming machine Package List: 20 x Carbon Brushes Note: 1. If sparks appear after the installation of new carbon brushes, please continue to run for 1‑2 minutes, the sparks will disappear naturally after the carbon brushes are fully ground.2. If the new carbon brush is worn out soon when using, this situation is mostly caused by the unevenness of the commutator. Check whether the rotor is concave or convex.3. After the new carbon brush is installed on the machine, the wire is burnt out. Please stop using it immediately and check the equipment to avoid other damages. This situation is caused by excessive current due to desoldering, short circuit, dust and other situation. Please deal with it in time.