If you drilll in wood, chipboard, MDF, plywood or similar materials, wood drills are better than metal drills. Wood drill has a strong tip that makes it possible to drill very accurately. They depart the cuttings from the drilling hole. Wood drills are ususally a combination of black and matt. They are available for standard diameter from 3-20 mm, but a standard set varies from 3-10 mm. The length to the diameter is increased from 35 to about 200 mm. Wood drills fit a standard drilling chuch and are always used without impact.