Everything you need in one handy set, the Milwaukee Hole Saw Kit includes thin-wall hole saw in the following sizes: 7/8" (49-56-9810), 1-1/8" (49-56-9820), and 1-3/8" (49-56-9830). Ideal for use in plastics and thin-gauge metals up to an 1/8” thick, Milwaukee thin-wall hole saws provide a professional hole-making solution with impact drivers. Featuring a ¼” hex shank and utilizing a thin wall 8-TPI design, the saws deliver a burr-free cut much faster than standard bi-metal hole saws. The included ejection spring removes the frustration of manually removing slugs by automatically ejecting the material, while the top shoulder design prevents over drilling into material and potentially damaging inner components of the electrical and junction boxes.