Unlike other two hole pins that take a long time to right and are very difficult to use due to poorly finished edges, our aluminum hole pin set is quick and easy to use as the pins are ergonomically designed and individually inspected. APPLICATION: Fits flanges from 1/2Inch pipe to 12Inch class 150 flanges, and 1/2Inch to 8Inch class 300 flanges. Fits flanges up to 2Inch thick. Two hole pins flange aligner is a tool that allow you to align pipes so they can fit together both vertically and horizontally to the ground. Our heavy duty two hole pin set are made from premium quality hardened 6061 aluminum and anodized oxide, so it's and lasts for a long time. It's also very accurate and precise as the pipe flanges be aligned perfectly. The threads are well-machined as well. Easy to Use, Ergonomically Designed, High Quality 6061 Aluminum, Anodized Black Oxide Finish, , Light weight Construction., Weight: 0.41005980732 Pounds, Manufacturer: Aisuoka