uxcell 2pcs 15mm Diameter Carbide Hinge Boring Forstner Drill Bit, 7mm Shank 15mm Carbide Tip Forstner Drill Bit Drill flat bottomed holes without splintering Drill straight, angled and overlapping holes Two spurs and center spur to give repeated, clean and accurate hole cutting Drill precise flat bottom holes with no chipping in any thickness of soft wood