Check the listing for details. Square Machine Keys Half X 1 And Half Stainless. Condition: New – Open box. Listed at 10.00 USD. The product is a set of square machine keys that consist of half X1 and half stainless keys. These keys are likely used in access control equipment, specifically in the field of machine equipment. The keys are designed for use in various systems and may be essential for maintaining and repairing pins mechanisms. With a mix of traditional and stainless materials, these keys offer durability and versatility for various locking applications.