Left-hand bit – Used predominantly in specialized operations with CNC equipment.Gun drill bit – Designed to drill deep holes, extremely straight for guns they come up to 8” in diameter and over 20’ long.Ejector bit – A hollow design so that water can be run into the hole to remove chips.Core drill bit – For enlarging existing holes, such as enlarging a cast hole in a metal casting.Center and spotting drills – Used for machining to create a starter hole in an exact location or create a place for a center on a lathe.
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