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The DeWalt DW1803 7/16-Inch Quick Change Mandrel is used with a 1/2 inch or larger chuck and 1-1/4- to 2-1/8 inch hole saw. The primary application of a hole saw is to install pipe, copper tubing, or PVC. These saws can be used to cut a round hole in either wood or metal, and when used with the proper mandrel, they will fit most drills.