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|Changes hole saw sizes in seconds - Enlarging a hole is quick and easy with the HE1 Hole Enlarger Kit from Bosch. You use two hole saws, the original saw that you cut the first hole with and the hole saw size you want the new hole to be. You combine both hole saws with the dual adapter and us the mandrel to attach it to your drill. Insert the first hole saw tip into the hole and start enlarging. Provides easy plug removal with angled reinsertion of the pilot bit. Makes the Bosch Quick Change system universal. Quick change adapters fit most major brand of holesaws. Enlarges any existing hole that matches a hole saw diameter, starting with 9/16-in - 6-in. Includes: (1) 3/8-in Mandrel, (1) Starter Bit, (1) Dual Adapter, (2) Washers.|