Astro Pneumatic 3” Wire Wheel Hand Brush W/ Interchangeable Head 9025 Astro Pneumatic 3” Wire Wheel Hand Brush W/ Interchangeable Head 9025 is a brush that lasts longer, just rotate and retighten the wheel when the wire bristles wear or flatten. Astro Pneumatic 3” Wire Wheel Hand Brush W/ Interchangeable Head 9025 can be replaced when fully worn with any common 3” wire brush wheel and is perfect for cleaning welding beads and slag on sheet metal.