This listing is for a set of 2 keys for the Simplex Model 100/125 time clock (part number 607-403). These keys are compatible with the traditional punch clock time clock type and were manufactured in the United States under the Simplex brand. The keys are designed specifically for use with the Simplex Model 100/125 and are an essential part of the clock's operation. They are made with high-quality materials to ensure durability and longevity. This is a great opportunity to purchase replacement keys for your Simplex time clock without having to worry about the condition of the item.