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Specification:Product Name Hinge Boring Bit Suitable for Wood Cutting Drilling Diameter 35mm / 1.4"Shank Size(Small) 27 x 8.2mm/ 1.1" x 0.32"(L*D) Shank Size(Big) 39 x 10.8mm/1.5" x 0.43"(L*D) Total Length 80mm / 3.1" Material Metal, Carbide Color Gray, Blue Weight 71g Package Content 1 x Hinge Boring Bit Description: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.