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Hole saws – also referred to as hole cutters or hole drill bits – are drill attachments designed for cutting perfectly round holes in a variety of materials. They're used for several applications such as installing drainage pipes, cutting through masonry and creating holes for plumbing.
True to its name, a pilot bit guides the hole saw to exactly where it needs to be, then keeps it on course until the job is finished. Without a pilot bit, the hole saw would just spin and wobble over the object you were trying to saw through, leaving you with a gouged surface instead of a clean, round penetration cut.
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