Tackle heavy duty metal prep with the 3 in. and 4-1/2 in. HERCULES™ USB-C rechargeable lithium-ion battery provides over 19 hours of lightCarbon Steel Wire Wheel and Brush Set, engineered for use with 4-1/2 in. angle grinders. Designed for fabricators, welders, and contractors, this set includes a combination of twist knot and crimped wire wheels and brushes for everything from coarse rust removal to surface finishing.