Used for drilling in woodworking in preference to drill bits and flat bits whenever a very clean and precise hole is required. Enable woodworkers to drill holes without passing through the material when a clean and precise bottom to a hole is required. 2 Flutes Designed to make professional flat bottom holes, and clean through holes. Can open any hole on various wood products, plastics, plywood and other materials. Designed to make professional, flat-bottom holes and clean-thru holes. Specification: Product: Forstner Bits Material: Carbide Alloy Color: Silver Total Length: Approx.7.5cm or 2.95inch Top Handle Dia.: 8mm or 0.31inch Tapping Dia.: 40mm or 1.57inch 45mm or 1.77inch Package Includes: 2 pieces Forstner Bits Note: Please allow 1-3mm error due to manual measurement, make sure you do not mind before you bid. The colors may be different for the different display, please understand.