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Product Description Quick Change Hole Saw Arbor, Shank Size 7/16 In., Shank Shape Hex, Fits Hole Saw Dia. 1-1/4 In. and Larger, Thread Size 5/8-18, Replacement Pilot Drill No. Mfr. No. 49-56-8010, Material High Speed Steel, Pilot Drill Size 1/4 In. dia. x 3-1/2 In. L, For Use With Drill chucks 1/2 In. and larger, Includes 1 Large Thread Quick Change Arbor Milwaukee hole saw arbors are made from hardened carbon steel and alloy steel for greater durability. The 49-56-9100 features a 7/16 in. hex shank, which can be used with any 7/16 in. extension. The 49-56-9100 also features a drive plate which is tightened up to the hole saw to eliminate wobble between the arbor and hole saw. From the Manufacturer Milwaukee hole saw arbors are made from hardened carbon steel and alloy steel for greater durability. The 49-56-9100 features a 7/16 in. hex shank, which can be used with any 7/16 in. extension. The 49-56-9100 also features a drive plate which is tightened up to the hole saw to eliminate wobble between the arbor and hole saw.