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53mm cutting diameter hinge boring drill bit silver Tone blue.The hinge boring bit is specialized in opening holes in soft and hard wood.Twin scribers and centering point to give the perfect solution to repeated, clean and accurate hole cutting time after time.Precision ground for heavy use and easily resharpened, it can enlarge existing holes with ease and can bore any Arc of a Circle.Carbide tip is specially designed to pass through hole cleanly in end grain and thin stock, great for boring concealed hinges and door clocks.Should work with an Electric drilling tool, which is not included here .