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Achieve flawless countersunk holes and optimize airflow with EGC Supply's complete selection of counterbores and porting tools! Whether you're a professional machinist or a detail-oriented DIYer, we have the tools you need for precise results and enhanced performance. Simplify your workflow with our combination drill and counterbores. These versatile tools combine drilling and countersinking into a single step, saving you time and effort. We also offer interchangeable-pilot counterbores and counterbore pilots for ultimate flexibility, allowing you to customize the tool for different size requirements. Expand your capabilities with EGC Supply's porting tools and inserts. These specialized tools are designed for creating smooth, optimized channels in engine blocks, cylinder heads, and other components, improving airflow and overall performance. We carry a variety of inserts to suit different porting applications. Need a clean, flat surface? Explore our reverse counterbores, also known as spot facers. These tools create a flat, machined surface around a drilled hole, ideal for bolt heads or other applications requiring a precise seating area. For ultimate control and precision, choose solid pilot counterbores. EGC Supply offers both individual solid pilot counterbores and convenient sets in various sizes. These tools ensure perfect centering and depth control for countersunk holes.