The DEWALT Brad Point Drill bits are manufactured from chrome vanadium alloyed steel. A centre location point and outer cutting spurs ensure clean accurate holes.For diameters 11mm and above, the shank is reduced to 9.5mm. Brad point drill bits are suitable for drilling hardboard, plywood, chipboard and all natural hard and softwood.The DEWALT Brad Point 5 piece drillbit set comes with the following sizes: 4 x 80mm, 5 x 90mm, 6 x 100mm, 8 x 120mm and 10 x 133mm.