Milwaukee 5PK SM Thread QUIK-LOK™ Adapters are designed to provide a reliable and universal fit for hole saws ranging from 9/16" to 1-3/16". These adapters feature a threaded design 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, they ensure quick and secure attachment for efficient cutting performance. Please note that these adapters are not compatible with the BIGHAWG™ system, making them i for users who rely on the QUIK-LOK™ system for their hole saw needs. Model Number: 49-56-7573