Keyseat milling cutter sets contain multiple keyseat cutters in a range of sizes. They save users the time and hassle of purchasing the tools individually and are a good choice for manufacturing and production environments that regularly use a variety of keyseat cutters. Also known as Woodruff cutters, keyseat milling cutters cut keyseats in shafts for mating keyed parts to the shafts. The keyseat engages with the key on the part to prevent unwanted rotation of the part when it is mounted to the shaft. Keyseat milling cutters are each sized to create keyseats for a specific size of key. They can also be used to make slots in parts.