Keystone Engineering is a manufacturing company specializing in downhole high-strength and high-temperature composites for the oilfield industry. With over 65 years of experience, they offer CNC machining, turnkey assembly, and instrumentation work for wireline, Frac, and MWD tools. Keystone Engineering fabricates composite materials with high strength at temperatures up to 400°F, ideal for well environments. They focus on manufacturing products to customer design requirements, including formation measurement instrument assemblies and composite bridge plugs. Additionally, the company provides a range of services such as composite fabrication, CNC machining, instrument production, and prototype development for the upstream petroleum industry.