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MetalHead proximity sensors are made of one piece of Stainless Steel. The Stainless rod is bored out from the end, turned and threaded and fully potted on the inside to create a durable sensor for applications where durability, corrosion resistance, and abrasion resistance are required. These sensors come in M5, M8, M12, M18, and M30 versions and all offer extra durability for the same price as many plastic face types in the industry.