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CMT 317.380.12 Hinge Boring Bit 38 x 57.5mm LH Wood Sanders A predrilled pilot hole usingThe CMT 317. 380 is a (Hinge Boring Bit (57. 5mm)). Hinge boring bit for drilling flat bottom hinge cup holes in cabinet doors and face frames. The flat bottom geometry is required for European style concealed hinges. Rotation: Left hand (LH). SPECIFICATIONS Diameter (D) 38mm Total Length (L) 57. 7mm Shank (S) 10x26mm Tooth Geometry Negatively ground spurs Spurs 2 Number of Teeth 2 Product Type Hinge Boring Bit Series Hinge Boring Bit (57. 5mm)