O'Reilly Automotive, Inc. is a specialty retailer of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States, serving both the do-it-yourself and professional service provider markets. The Company's stores carry various product line, including new and remanufactured automotive hard parts and maintenance items, such as alternators, batteries, brake system components, belts, chassis parts, driveline parts, engine parts, fuel pumps, hoses, starters, temperature control, water pumps, antifreeze, appearance products, engine additives, filters, fluids, lighting, oil and wiper blades, and accessories, such as floor mats, seat covers and truck accessories. Its stores offer various enhanced services and programs to its customers, such as battery diagnostic testing; battery, wiper and bulb replacement; custom hydraulic hoses, and drum and rotor resurfacing. It operates approximately 6,157 stores across 48 states in United States, Puerto Rico and Mexico.