Milwaukee 5PK LRG Thread QUIK-LOK™Adapters are designed to provide a reliable and universal fit for hole saws ranging from 1-1/4" to 2" in size. These adapters feature a threaded design with a 5/8" x 18 thread size, making them compatible with all industry-standard threaded hole saws within this size range. Specifically engineered for use with the Milwaukee QUIK-LOK™ Hole Saw Arbor System, these adapters ensure a secure connection and efficient performance. Please note that they are not compatible with the BIGHAWG™ system. Model Number: 49-56-7571