Large Quick Change Arbor, 3/8 in. Milwaukee® hole saw arbors are made from hardened carbon steel and alloy steel for greater durability. The 49-56-7250 features a hex shank which can be used with any 3/8 in. extension. The 49-56-7250 also features a drive plate with an enlarged grip area for easier operation. Features: Tool-free operation Universal, quick change with all brands of hole saws No adapters required Twist to release Durable hardened steel construction Fits all hole saws 1-1/4 in. and larger Fits all drill chucks 3/8 in. and larger Since its founding in 1924, Milwaukee has focused on a single vision: To produce the best heavy-duty electric power tools and accessories available to the professional user. Today, the Milwaukee name stands for the highest quality, durable and reliable professional tools money can buy.