Milwaukee 7/16" QUIK-LOK™ Arbor Set a universal fit compatible with all industry standard threaded hole saw sizes, providing the fastest hole saw changes to help you work efficiently. This set includes adapters that ensure compatibility with both small-thread and large-hole saws, eliminating the need for multiple arbors and saving you time and money. Designed with durability, the QUIK-LOK™ system delivers the strength and reliability required for the demanding conditions of any job site. Its threaded design maintains hole enlargement capability, while the reusable pin adapter works with hole saws ranging from 1-1/4" up to 6-7/8" without the risk of thread stripping or binding. The small thread adapter fits hole saws from 9/16" to 1-3/16", and the large thread adapter is intended for hole saws from 1-1/4" up to 2". For BIGHAWG™ and deep cup hole saws, the 49-56-9300 pilot bit and 49-56-7575 adapter are required. Model Number: 49-56-7555