These DEWALT Self-Feed Drill Bits are ideal for drilling of clean holes in wood, MDFMedium Density Fibreboard. It is a wood based product engineered from hard or softwood fibres combined with wax and resin, usually formed into sheet material., hardboard and chipboard. They have two sharp cutting edges and an aggressive ‘self feed’ spur for rapid penetration into material. They are fitted with a non-slip shank for better in chuck bit retention.