Fisch FSA-197058 1/4-Inch-1-Inch Diameter Wave Cutter Forstner Bit  In Wooden Box, 7-Piece Suitable for hard and softwood, coated chip board, laminates as well as MDF plates High Rotation Speed Precise Cutting Quality Optimized cutting resulting in an improved running of your drill Can be resharpened up to 30 times before needing to be replaced