MIBRO 409671 The Edge Forstner Bit Set, 1/4in. to 1in., 7 Pieces Faster - Patented, serrated edge easily removes chips and dissipates heat, increasing cutting speed Cleaner - the serrated edge and razor sharp cutting edge means exceptionally accurate, smooth, flat bottomed holes Tougher - high speed steel with a titanium nitride coating guarantees performance in hardwoods and abrasive composite materials Convenient wood storage case